From e899bc96f0e8c546762124bc60362f46d980d9f4 Mon Sep 17 00:00:00 2001
From: Scott Richmond <kredati@users.noreply.github.com>
Date: Sat, 15 Jun 2024 21:53:09 -0400
Subject: [PATCH] updated doc

---
 prelude.md | 235 +++++++++++++++--------------------------------------
 1 file changed, 66 insertions(+), 169 deletions(-)

diff --git a/prelude.md b/prelude.md
index 2d9cec6..c6f14f2 100644
--- a/prelude.md
+++ b/prelude.md
@@ -37,10 +37,10 @@ You can see what this looks like in the last clause of `add`: `((x1, y1), (x2, y
 
 ## Functions by topic
 ### Boolean
-[and](#and)&nbsp;&nbsp;&nbsp; [bool](#bool)&nbsp;&nbsp;&nbsp; [bool?](#bool)&nbsp;&nbsp;&nbsp; [false?](#false)&nbsp;&nbsp;&nbsp; [not](#not)&nbsp;&nbsp;&nbsp; [or](#or)
+[and](#and)&nbsp;&nbsp;&nbsp; [bool](#bool)&nbsp;&nbsp;&nbsp; [bool?](#bool)&nbsp;&nbsp;&nbsp; [false?](#false)&nbsp;&nbsp;&nbsp; [not](#not)&nbsp;&nbsp;&nbsp; [or](#or)&nbsp;&nbsp;&nbsp; [true?](#true)
 
 ### Boxes and state
-[store!](#store)&nbsp;&nbsp;&nbsp; [unbox](#unbox)&nbsp;&nbsp;&nbsp; [update!](#update)
+[box?](#box)&nbsp;&nbsp;&nbsp; [store!](#store)&nbsp;&nbsp;&nbsp; [unbox](#unbox)&nbsp;&nbsp;&nbsp; [update!](#update)
 
 ### Dicts
 [any?](#any)&nbsp;&nbsp;&nbsp; [assoc](#assoc)&nbsp;&nbsp;&nbsp; [assoc?](#assoc)&nbsp;&nbsp;&nbsp; [coll?](#coll)&nbsp;&nbsp;&nbsp; [count](#count)&nbsp;&nbsp;&nbsp; [dict](#dict)&nbsp;&nbsp;&nbsp; [dict?](#dict)&nbsp;&nbsp;&nbsp; [diff](#diff)&nbsp;&nbsp;&nbsp; [dissoc](#dissoc)&nbsp;&nbsp;&nbsp; [empty?](#empty)&nbsp;&nbsp;&nbsp; [get](#get)&nbsp;&nbsp;&nbsp; [keys](#keys)&nbsp;&nbsp;&nbsp; [random](#random)&nbsp;&nbsp;&nbsp; [update](#update)&nbsp;&nbsp;&nbsp; [values](#values)
@@ -55,27 +55,30 @@ You can see what this looks like in the last clause of `add`: `((x1, y1), (x2, y
 [any?](#any)&nbsp;&nbsp;&nbsp; [append](#append)&nbsp;&nbsp;&nbsp; [at](#at)&nbsp;&nbsp;&nbsp; [butlast](#butlast)&nbsp;&nbsp;&nbsp; [coll?](#coll)&nbsp;&nbsp;&nbsp; [concat](#concat)&nbsp;&nbsp;&nbsp; [count](#count)&nbsp;&nbsp;&nbsp; [each!](#each)&nbsp;&nbsp;&nbsp; [empty?](#empty)&nbsp;&nbsp;&nbsp; [filter](#filter)&nbsp;&nbsp;&nbsp; [first](#first)&nbsp;&nbsp;&nbsp; [fold](#fold)&nbsp;&nbsp;&nbsp; [join](#join)&nbsp;&nbsp;&nbsp; [keep](#keep)&nbsp;&nbsp;&nbsp; [last](#last)&nbsp;&nbsp;&nbsp; [list](#list)&nbsp;&nbsp;&nbsp; [list?](#list)&nbsp;&nbsp;&nbsp; [map](#map)&nbsp;&nbsp;&nbsp; [ordered?](#ordered)&nbsp;&nbsp;&nbsp; [random](#random)&nbsp;&nbsp;&nbsp; [range](#range)&nbsp;&nbsp;&nbsp; [rest](#rest)&nbsp;&nbsp;&nbsp; [second](#second)&nbsp;&nbsp;&nbsp; [sentence](#sentence)&nbsp;&nbsp;&nbsp; [slice](#slice)
 
 ### Math
-[abs](#abs)&nbsp;&nbsp;&nbsp; [add](#add)&nbsp;&nbsp;&nbsp; [angle](#angle)&nbsp;&nbsp;&nbsp; [atan/2](#atan/2)&nbsp;&nbsp;&nbsp; [between?](#between)&nbsp;&nbsp;&nbsp; [ceil](#ceil)&nbsp;&nbsp;&nbsp; [cos](#cos)&nbsp;&nbsp;&nbsp; [dec](#dec)&nbsp;&nbsp;&nbsp; [deg/rad](#deg/rad)&nbsp;&nbsp;&nbsp; [deg/turn](#deg/turn)&nbsp;&nbsp;&nbsp; [dist](#dist)&nbsp;&nbsp;&nbsp; [div](#div)&nbsp;&nbsp;&nbsp; [div/0](#div/0)&nbsp;&nbsp;&nbsp; [div/safe](#div/safe)&nbsp;&nbsp;&nbsp; [even?](#even)&nbsp;&nbsp;&nbsp; [floor](#floor)&nbsp;&nbsp;&nbsp; [gt?](#gt)&nbsp;&nbsp;&nbsp; [gte?](#gte)&nbsp;&nbsp;&nbsp; [heading/vector](#heading/vector)&nbsp;&nbsp;&nbsp; [inc](#inc)&nbsp;&nbsp;&nbsp; [inv](#inv)&nbsp;&nbsp;&nbsp; [inv/0](#inv/0)&nbsp;&nbsp;&nbsp; [inv/safe](#inv/safe)&nbsp;&nbsp;&nbsp; [lt?](#lt)&nbsp;&nbsp;&nbsp; [lte?](#lte)&nbsp;&nbsp;&nbsp; [max](#max)&nbsp;&nbsp;&nbsp; [min](#min)&nbsp;&nbsp;&nbsp; [mod](#mod)&nbsp;&nbsp;&nbsp; [mult](#mult)&nbsp;&nbsp;&nbsp; [neg](#neg)&nbsp;&nbsp;&nbsp; [neg?](#neg)&nbsp;&nbsp;&nbsp; [odd?](#odd)&nbsp;&nbsp;&nbsp; [pi](#pi)&nbsp;&nbsp;&nbsp; [pos?](#pos)&nbsp;&nbsp;&nbsp; [rad/deg](#rad/deg)&nbsp;&nbsp;&nbsp; [rad/turn](#rad/turn)&nbsp;&nbsp;&nbsp; [random](#random)&nbsp;&nbsp;&nbsp; [random\_int](#random\_int)&nbsp;&nbsp;&nbsp; [range](#range)&nbsp;&nbsp;&nbsp; [round](#round)&nbsp;&nbsp;&nbsp; [sin](#sin)&nbsp;&nbsp;&nbsp; [square](#square)&nbsp;&nbsp;&nbsp; [sub](#sub)&nbsp;&nbsp;&nbsp; [sum\_of_squares](#sum\_of_squares)&nbsp;&nbsp;&nbsp; [tan](#tan)&nbsp;&nbsp;&nbsp; [tau](#tau)&nbsp;&nbsp;&nbsp; [turn/deg](#turn/deg)&nbsp;&nbsp;&nbsp; [turn/rad](#turn/rad)&nbsp;&nbsp;&nbsp; [zero?](#zero)
+[abs](#abs)&nbsp;&nbsp;&nbsp; [add](#add)&nbsp;&nbsp;&nbsp; [angle](#angle)&nbsp;&nbsp;&nbsp; [atan/2](#atan/2)&nbsp;&nbsp;&nbsp; [between?](#between)&nbsp;&nbsp;&nbsp; [ceil](#ceil)&nbsp;&nbsp;&nbsp; [cos](#cos)&nbsp;&nbsp;&nbsp; [dec](#dec)&nbsp;&nbsp;&nbsp; [deg/rad](#deg/rad)&nbsp;&nbsp;&nbsp; [deg/turn](#deg/turn)&nbsp;&nbsp;&nbsp; [dist](#dist)&nbsp;&nbsp;&nbsp; [div](#div)&nbsp;&nbsp;&nbsp; [div/0](#div/0)&nbsp;&nbsp;&nbsp; [div/safe](#div/safe)&nbsp;&nbsp;&nbsp; [even?](#even)&nbsp;&nbsp;&nbsp; [floor](#floor)&nbsp;&nbsp;&nbsp; [gt?](#gt)&nbsp;&nbsp;&nbsp; [gte?](#gte)&nbsp;&nbsp;&nbsp; [heading/vector](#heading/vector)&nbsp;&nbsp;&nbsp; [inc](#inc)&nbsp;&nbsp;&nbsp; [inv](#inv)&nbsp;&nbsp;&nbsp; [inv/0](#inv/0)&nbsp;&nbsp;&nbsp; [inv/safe](#inv/safe)&nbsp;&nbsp;&nbsp; [lt?](#lt)&nbsp;&nbsp;&nbsp; [lte?](#lte)&nbsp;&nbsp;&nbsp; [max](#max)&nbsp;&nbsp;&nbsp; [min](#min)&nbsp;&nbsp;&nbsp; [mod](#mod)&nbsp;&nbsp;&nbsp; [mod/0](#mod/0)&nbsp;&nbsp;&nbsp; [mod/safe](#mod/safe)&nbsp;&nbsp;&nbsp; [mult](#mult)&nbsp;&nbsp;&nbsp; [neg](#neg)&nbsp;&nbsp;&nbsp; [neg?](#neg)&nbsp;&nbsp;&nbsp; [odd?](#odd)&nbsp;&nbsp;&nbsp; [pi](#pi)&nbsp;&nbsp;&nbsp; [pos?](#pos)&nbsp;&nbsp;&nbsp; [rad/deg](#rad/deg)&nbsp;&nbsp;&nbsp; [rad/turn](#rad/turn)&nbsp;&nbsp;&nbsp; [random](#random)&nbsp;&nbsp;&nbsp; [random\_int](#random\_int)&nbsp;&nbsp;&nbsp; [range](#range)&nbsp;&nbsp;&nbsp; [round](#round)&nbsp;&nbsp;&nbsp; [sin](#sin)&nbsp;&nbsp;&nbsp; [sqrt](#sqrt)&nbsp;&nbsp;&nbsp; [sqrt/safe](#sqrt/safe)&nbsp;&nbsp;&nbsp; [square](#square)&nbsp;&nbsp;&nbsp; [sub](#sub)&nbsp;&nbsp;&nbsp; [sum\_of_squares](#sum\_of_squares)&nbsp;&nbsp;&nbsp; [tan](#tan)&nbsp;&nbsp;&nbsp; [tau](#tau)&nbsp;&nbsp;&nbsp; [turn/deg](#turn/deg)&nbsp;&nbsp;&nbsp; [turn/rad](#turn/rad)&nbsp;&nbsp;&nbsp; [zero?](#zero)
 
 ### Results
 [err](#err)&nbsp;&nbsp;&nbsp; [err?](#err)&nbsp;&nbsp;&nbsp; [ok](#ok)&nbsp;&nbsp;&nbsp; [ok?](#ok)&nbsp;&nbsp;&nbsp; [unwrap!](#unwrap)&nbsp;&nbsp;&nbsp; [unwrap\_or](#unwrap\_or)
 
 ### Sets
-[any?](#any)&nbsp;&nbsp;&nbsp; [append](#append)&nbsp;&nbsp;&nbsp; [coll?](#coll)&nbsp;&nbsp;&nbsp; [concat](#concat)&nbsp;&nbsp;&nbsp; [count](#count)&nbsp;&nbsp;&nbsp; [empty?](#empty)&nbsp;&nbsp;&nbsp; [random](#random)&nbsp;&nbsp;&nbsp; [set](#set)&nbsp;&nbsp;&nbsp; [set?](#set)
+[any?](#any)&nbsp;&nbsp;&nbsp; [append](#append)&nbsp;&nbsp;&nbsp; [coll?](#coll)&nbsp;&nbsp;&nbsp; [concat](#concat)&nbsp;&nbsp;&nbsp; [contains?](#contains)&nbsp;&nbsp;&nbsp; [count](#count)&nbsp;&nbsp;&nbsp; [empty?](#empty)&nbsp;&nbsp;&nbsp; [omit](#omit)&nbsp;&nbsp;&nbsp; [random](#random)&nbsp;&nbsp;&nbsp; [set](#set)&nbsp;&nbsp;&nbsp; [set?](#set)
 
 ### Strings
 [any?](#any)&nbsp;&nbsp;&nbsp; [concat](#concat)&nbsp;&nbsp;&nbsp; [count](#count)&nbsp;&nbsp;&nbsp; [downcase](#downcase)&nbsp;&nbsp;&nbsp; [empty?](#empty)&nbsp;&nbsp;&nbsp; [join](#join)&nbsp;&nbsp;&nbsp; [sentence](#sentence)&nbsp;&nbsp;&nbsp; [show](#show)&nbsp;&nbsp;&nbsp; [slice](#slice)&nbsp;&nbsp;&nbsp; [split](#split)&nbsp;&nbsp;&nbsp; [string](#string)&nbsp;&nbsp;&nbsp; [string?](#string)&nbsp;&nbsp;&nbsp; [strip](#strip)&nbsp;&nbsp;&nbsp; [trim](#trim)&nbsp;&nbsp;&nbsp; [upcase](#upcase)&nbsp;&nbsp;&nbsp; [words](#words)
 
+### Tuples
+[any?](#any)&nbsp;&nbsp;&nbsp; [at](#at)&nbsp;&nbsp;&nbsp; [coll?](#coll)&nbsp;&nbsp;&nbsp; [count](#count)&nbsp;&nbsp;&nbsp; [empty?](#empty)&nbsp;&nbsp;&nbsp; [first](#first)&nbsp;&nbsp;&nbsp; [ordered?](#ordered)&nbsp;&nbsp;&nbsp; [second](#second)&nbsp;&nbsp;&nbsp; [tuple?](#tuple)
+
 ### Turtle graphics
 [back!](#back)&nbsp;&nbsp;&nbsp; [background!](#background)&nbsp;&nbsp;&nbsp; [bk!](#bk)&nbsp;&nbsp;&nbsp; [clear!](#clear)&nbsp;&nbsp;&nbsp; [colors](#colors)&nbsp;&nbsp;&nbsp; [fd!](#fd)&nbsp;&nbsp;&nbsp; [forward!](#forward)&nbsp;&nbsp;&nbsp; [goto!](#goto)&nbsp;&nbsp;&nbsp; [heading](#heading)&nbsp;&nbsp;&nbsp; [heading/vector](#heading/vector)&nbsp;&nbsp;&nbsp; [home!](#home)&nbsp;&nbsp;&nbsp; [left!](#left)&nbsp;&nbsp;&nbsp; [lt!](#lt)&nbsp;&nbsp;&nbsp; [pc!](#pc)&nbsp;&nbsp;&nbsp; [pd!](#pd)&nbsp;&nbsp;&nbsp; [pencolor](#pencolor)&nbsp;&nbsp;&nbsp; [pencolor!](#pencolor)&nbsp;&nbsp;&nbsp; [pendown!](#pendown)&nbsp;&nbsp;&nbsp; [pendown?](#pendown)&nbsp;&nbsp;&nbsp; [penup!](#penup)&nbsp;&nbsp;&nbsp; [penwidth](#penwidth)&nbsp;&nbsp;&nbsp; [penwidth!](#penwidth)&nbsp;&nbsp;&nbsp; [position](#position)&nbsp;&nbsp;&nbsp; [pu!](#pu)&nbsp;&nbsp;&nbsp; [pw!](#pw)&nbsp;&nbsp;&nbsp; [render\_turtle!](#render\_turtle)&nbsp;&nbsp;&nbsp; [reset\_turtle!](#reset\_turtle)&nbsp;&nbsp;&nbsp; [right!](#right)&nbsp;&nbsp;&nbsp; [rt!](#rt)&nbsp;&nbsp;&nbsp; [turtle\_state](#turtle\_state)
 
 ### Types and values
-[assoc?](#assoc)&nbsp;&nbsp;&nbsp; [bool?](#bool)&nbsp;&nbsp;&nbsp; [coll?](#coll)&nbsp;&nbsp;&nbsp; [dict?](#dict)&nbsp;&nbsp;&nbsp; [eq?](#eq)&nbsp;&nbsp;&nbsp; [fn?](#fn)&nbsp;&nbsp;&nbsp; [keyword?](#keyword)&nbsp;&nbsp;&nbsp; [list?](#list)&nbsp;&nbsp;&nbsp; [neq?](#neq)&nbsp;&nbsp;&nbsp; [nil?](#nil)&nbsp;&nbsp;&nbsp; [number?](#number)&nbsp;&nbsp;&nbsp; [ordered?](#ordered)&nbsp;&nbsp;&nbsp; [show](#show)&nbsp;&nbsp;&nbsp; [some](#some)&nbsp;&nbsp;&nbsp; [some?](#some)&nbsp;&nbsp;&nbsp; [string?](#string)&nbsp;&nbsp;&nbsp; [type](#type)
+[assoc?](#assoc)&nbsp;&nbsp;&nbsp; [bool?](#bool)&nbsp;&nbsp;&nbsp; [box?](#box)&nbsp;&nbsp;&nbsp; [coll?](#coll)&nbsp;&nbsp;&nbsp; [dict?](#dict)&nbsp;&nbsp;&nbsp; [eq?](#eq)&nbsp;&nbsp;&nbsp; [fn?](#fn)&nbsp;&nbsp;&nbsp; [keyword?](#keyword)&nbsp;&nbsp;&nbsp; [list?](#list)&nbsp;&nbsp;&nbsp; [neq?](#neq)&nbsp;&nbsp;&nbsp; [nil?](#nil)&nbsp;&nbsp;&nbsp; [number?](#number)&nbsp;&nbsp;&nbsp; [ordered?](#ordered)&nbsp;&nbsp;&nbsp; [set?](#set)&nbsp;&nbsp;&nbsp; [show](#show)&nbsp;&nbsp;&nbsp; [some](#some)&nbsp;&nbsp;&nbsp; [some?](#some)&nbsp;&nbsp;&nbsp; [string?](#string)&nbsp;&nbsp;&nbsp; [tuple?](#tuple)&nbsp;&nbsp;&nbsp; [type](#type)
     
 ## All functions, alphabetically
-[abs](#abs)&nbsp;&nbsp;&nbsp; [add](#add)&nbsp;&nbsp;&nbsp; [and](#and)&nbsp;&nbsp;&nbsp; [angle](#angle)&nbsp;&nbsp;&nbsp; [any?](#any)&nbsp;&nbsp;&nbsp; [append](#append)&nbsp;&nbsp;&nbsp; [assert!](#assert)&nbsp;&nbsp;&nbsp; [assoc](#assoc)&nbsp;&nbsp;&nbsp; [assoc?](#assoc)&nbsp;&nbsp;&nbsp; [at](#at)&nbsp;&nbsp;&nbsp; [atan/2](#atan/2)&nbsp;&nbsp;&nbsp; [back!](#back)&nbsp;&nbsp;&nbsp; [background!](#background)&nbsp;&nbsp;&nbsp; [between?](#between)&nbsp;&nbsp;&nbsp; [bg!](#bg)&nbsp;&nbsp;&nbsp; [bgcolor](#bgcolor)&nbsp;&nbsp;&nbsp; [bk!](#bk)&nbsp;&nbsp;&nbsp; [bool](#bool)&nbsp;&nbsp;&nbsp; [bool?](#bool)&nbsp;&nbsp;&nbsp; [box?](#box)&nbsp;&nbsp;&nbsp; [butlast](#butlast)&nbsp;&nbsp;&nbsp; [ceil](#ceil)&nbsp;&nbsp;&nbsp; [clear!](#clear)&nbsp;&nbsp;&nbsp; [coll?](#coll)&nbsp;&nbsp;&nbsp; [colors](#colors)&nbsp;&nbsp;&nbsp; [concat](#concat)&nbsp;&nbsp;&nbsp; [cos](#cos)&nbsp;&nbsp;&nbsp; [count](#count)&nbsp;&nbsp;&nbsp; [dec](#dec)&nbsp;&nbsp;&nbsp; [deg/rad](#deg/rad)&nbsp;&nbsp;&nbsp; [deg/turn](#deg/turn)&nbsp;&nbsp;&nbsp; [dict](#dict)&nbsp;&nbsp;&nbsp; [dict?](#dict)&nbsp;&nbsp;&nbsp; [diff](#diff)&nbsp;&nbsp;&nbsp; [dissoc](#dissoc)&nbsp;&nbsp;&nbsp; [dist](#dist)&nbsp;&nbsp;&nbsp; [div](#div)&nbsp;&nbsp;&nbsp; [div/0](#div/0)&nbsp;&nbsp;&nbsp; [div/safe](#div/safe)&nbsp;&nbsp;&nbsp; [doc!](#doc)&nbsp;&nbsp;&nbsp; [downcase](#downcase)&nbsp;&nbsp;&nbsp; [each!](#each)&nbsp;&nbsp;&nbsp; [empty?](#empty)&nbsp;&nbsp;&nbsp; [eq?](#eq)&nbsp;&nbsp;&nbsp; [err](#err)&nbsp;&nbsp;&nbsp; [err?](#err)&nbsp;&nbsp;&nbsp; [even?](#even)&nbsp;&nbsp;&nbsp; [false?](#false)&nbsp;&nbsp;&nbsp; [fd!](#fd)&nbsp;&nbsp;&nbsp; [filter](#filter)&nbsp;&nbsp;&nbsp; [first](#first)&nbsp;&nbsp;&nbsp; [floor](#floor)&nbsp;&nbsp;&nbsp; [fn?](#fn)&nbsp;&nbsp;&nbsp; [fold](#fold)&nbsp;&nbsp;&nbsp; [forward!](#forward)&nbsp;&nbsp;&nbsp; [get](#get)&nbsp;&nbsp;&nbsp; [goto!](#goto)&nbsp;&nbsp;&nbsp; [gt?](#gt)&nbsp;&nbsp;&nbsp; [gte?](#gte)&nbsp;&nbsp;&nbsp; [heading](#heading)&nbsp;&nbsp;&nbsp; [heading/vector](#heading/vector)&nbsp;&nbsp;&nbsp; [home!](#home)&nbsp;&nbsp;&nbsp; [inc](#inc)&nbsp;&nbsp;&nbsp; [inv](#inv)&nbsp;&nbsp;&nbsp; [inv/0](#inv/0)&nbsp;&nbsp;&nbsp; [inv/safe](#inv/safe)&nbsp;&nbsp;&nbsp; [join](#join)&nbsp;&nbsp;&nbsp; [keep](#keep)&nbsp;&nbsp;&nbsp; [keys](#keys)&nbsp;&nbsp;&nbsp; [keyword?](#keyword)&nbsp;&nbsp;&nbsp; [last](#last)&nbsp;&nbsp;&nbsp; [left!](#left)&nbsp;&nbsp;&nbsp; [list](#list)&nbsp;&nbsp;&nbsp; [list?](#list)&nbsp;&nbsp;&nbsp; [load\_turtle_state!](#load\_turtle_state)&nbsp;&nbsp;&nbsp; [lt!](#lt)&nbsp;&nbsp;&nbsp; [lt?](#lt)&nbsp;&nbsp;&nbsp; [lte?](#lte)&nbsp;&nbsp;&nbsp; [map](#map)&nbsp;&nbsp;&nbsp; [max](#max)&nbsp;&nbsp;&nbsp; [min](#min)&nbsp;&nbsp;&nbsp; [mod](#mod)&nbsp;&nbsp;&nbsp; [mult](#mult)&nbsp;&nbsp;&nbsp; [neg](#neg)&nbsp;&nbsp;&nbsp; [neg?](#neg)&nbsp;&nbsp;&nbsp; [neq?](#neq)&nbsp;&nbsp;&nbsp; [nil?](#nil)&nbsp;&nbsp;&nbsp; [not](#not)&nbsp;&nbsp;&nbsp; [odd?](#odd)&nbsp;&nbsp;&nbsp; [ok](#ok)&nbsp;&nbsp;&nbsp; [ok?](#ok)&nbsp;&nbsp;&nbsp; [or](#or)&nbsp;&nbsp;&nbsp; [ordered?](#ordered)&nbsp;&nbsp;&nbsp; [p5\_calls](#p5\_calls)&nbsp;&nbsp;&nbsp; [pc!](#pc)&nbsp;&nbsp;&nbsp; [pd!](#pd)&nbsp;&nbsp;&nbsp; [pencolor](#pencolor)&nbsp;&nbsp;&nbsp; [pencolor!](#pencolor)&nbsp;&nbsp;&nbsp; [pendown!](#pendown)&nbsp;&nbsp;&nbsp; [pendown?](#pendown)&nbsp;&nbsp;&nbsp; [penup!](#penup)&nbsp;&nbsp;&nbsp; [penwidth](#penwidth)&nbsp;&nbsp;&nbsp; [penwidth!](#penwidth)&nbsp;&nbsp;&nbsp; [pi](#pi)&nbsp;&nbsp;&nbsp; [pos?](#pos)&nbsp;&nbsp;&nbsp; [position](#position)&nbsp;&nbsp;&nbsp; [print!](#print)&nbsp;&nbsp;&nbsp; [pu!](#pu)&nbsp;&nbsp;&nbsp; [pw!](#pw)&nbsp;&nbsp;&nbsp; [rad/deg](#rad/deg)&nbsp;&nbsp;&nbsp; [rad/turn](#rad/turn)&nbsp;&nbsp;&nbsp; [random](#random)&nbsp;&nbsp;&nbsp; [random\_int](#random\_int)&nbsp;&nbsp;&nbsp; [range](#range)&nbsp;&nbsp;&nbsp; [render\_turtle!](#render\_turtle)&nbsp;&nbsp;&nbsp; [report!](#report)&nbsp;&nbsp;&nbsp; [reset\_turtle!](#reset\_turtle)&nbsp;&nbsp;&nbsp; [rest](#rest)&nbsp;&nbsp;&nbsp; [right!](#right)&nbsp;&nbsp;&nbsp; [round](#round)&nbsp;&nbsp;&nbsp; [rt!](#rt)&nbsp;&nbsp;&nbsp; [second](#second)&nbsp;&nbsp;&nbsp; [sentence](#sentence)&nbsp;&nbsp;&nbsp; [set](#set)&nbsp;&nbsp;&nbsp; [set?](#set)&nbsp;&nbsp;&nbsp; [show](#show)&nbsp;&nbsp;&nbsp; [sin](#sin)&nbsp;&nbsp;&nbsp; [slice](#slice)&nbsp;&nbsp;&nbsp; [some](#some)&nbsp;&nbsp;&nbsp; [some?](#some)&nbsp;&nbsp;&nbsp; [split](#split)&nbsp;&nbsp;&nbsp; [square](#square)&nbsp;&nbsp;&nbsp; [state](#state)&nbsp;&nbsp;&nbsp; [store!](#store)&nbsp;&nbsp;&nbsp; [string](#string)&nbsp;&nbsp;&nbsp; [string?](#string)&nbsp;&nbsp;&nbsp; [strip](#strip)&nbsp;&nbsp;&nbsp; [sub](#sub)&nbsp;&nbsp;&nbsp; [sum\_of_squares](#sum\_of_squares)&nbsp;&nbsp;&nbsp; [tan](#tan)&nbsp;&nbsp;&nbsp; [tau](#tau)&nbsp;&nbsp;&nbsp; [trim](#trim)&nbsp;&nbsp;&nbsp; [tuple?](#tuple)&nbsp;&nbsp;&nbsp; [turn/deg](#turn/deg)&nbsp;&nbsp;&nbsp; [turn/rad](#turn/rad)&nbsp;&nbsp;&nbsp; [turtle\_commands](#turtle\_commands)&nbsp;&nbsp;&nbsp; [turtle\_state](#turtle\_state)&nbsp;&nbsp;&nbsp; [turtle\_states](#turtle\_states)&nbsp;&nbsp;&nbsp; [type](#type)&nbsp;&nbsp;&nbsp; [unbox](#unbox)&nbsp;&nbsp;&nbsp; [unwrap!](#unwrap)&nbsp;&nbsp;&nbsp; [unwrap\_or](#unwrap\_or)&nbsp;&nbsp;&nbsp; [upcase](#upcase)&nbsp;&nbsp;&nbsp; [update](#update)&nbsp;&nbsp;&nbsp; [update!](#update)&nbsp;&nbsp;&nbsp; [values](#values)&nbsp;&nbsp;&nbsp; [words](#words)&nbsp;&nbsp;&nbsp; [ws?](#ws)&nbsp;&nbsp;&nbsp; [zero?](#zero)
+[abs](#abs)&nbsp;&nbsp;&nbsp; [add](#add)&nbsp;&nbsp;&nbsp; [and](#and)&nbsp;&nbsp;&nbsp; [angle](#angle)&nbsp;&nbsp;&nbsp; [any?](#any)&nbsp;&nbsp;&nbsp; [append](#append)&nbsp;&nbsp;&nbsp; [assert!](#assert)&nbsp;&nbsp;&nbsp; [assoc](#assoc)&nbsp;&nbsp;&nbsp; [assoc?](#assoc)&nbsp;&nbsp;&nbsp; [at](#at)&nbsp;&nbsp;&nbsp; [atan/2](#atan/2)&nbsp;&nbsp;&nbsp; [back!](#back)&nbsp;&nbsp;&nbsp; [background!](#background)&nbsp;&nbsp;&nbsp; [between?](#between)&nbsp;&nbsp;&nbsp; [bg!](#bg)&nbsp;&nbsp;&nbsp; [bgcolor](#bgcolor)&nbsp;&nbsp;&nbsp; [bk!](#bk)&nbsp;&nbsp;&nbsp; [bool](#bool)&nbsp;&nbsp;&nbsp; [bool?](#bool)&nbsp;&nbsp;&nbsp; [box?](#box)&nbsp;&nbsp;&nbsp; [butlast](#butlast)&nbsp;&nbsp;&nbsp; [ceil](#ceil)&nbsp;&nbsp;&nbsp; [clear!](#clear)&nbsp;&nbsp;&nbsp; [coll?](#coll)&nbsp;&nbsp;&nbsp; [colors](#colors)&nbsp;&nbsp;&nbsp; [concat](#concat)&nbsp;&nbsp;&nbsp; [contains?](#contains)&nbsp;&nbsp;&nbsp; [cos](#cos)&nbsp;&nbsp;&nbsp; [count](#count)&nbsp;&nbsp;&nbsp; [dec](#dec)&nbsp;&nbsp;&nbsp; [deg/rad](#deg/rad)&nbsp;&nbsp;&nbsp; [deg/turn](#deg/turn)&nbsp;&nbsp;&nbsp; [dict](#dict)&nbsp;&nbsp;&nbsp; [dict?](#dict)&nbsp;&nbsp;&nbsp; [diff](#diff)&nbsp;&nbsp;&nbsp; [dissoc](#dissoc)&nbsp;&nbsp;&nbsp; [dist](#dist)&nbsp;&nbsp;&nbsp; [div](#div)&nbsp;&nbsp;&nbsp; [div/0](#div/0)&nbsp;&nbsp;&nbsp; [div/safe](#div/safe)&nbsp;&nbsp;&nbsp; [doc!](#doc)&nbsp;&nbsp;&nbsp; [downcase](#downcase)&nbsp;&nbsp;&nbsp; [each!](#each)&nbsp;&nbsp;&nbsp; [empty?](#empty)&nbsp;&nbsp;&nbsp; [eq?](#eq)&nbsp;&nbsp;&nbsp; [err](#err)&nbsp;&nbsp;&nbsp; [err?](#err)&nbsp;&nbsp;&nbsp; [even?](#even)&nbsp;&nbsp;&nbsp; [false?](#false)&nbsp;&nbsp;&nbsp; [fd!](#fd)&nbsp;&nbsp;&nbsp; [filter](#filter)&nbsp;&nbsp;&nbsp; [first](#first)&nbsp;&nbsp;&nbsp; [floor](#floor)&nbsp;&nbsp;&nbsp; [fn?](#fn)&nbsp;&nbsp;&nbsp; [fold](#fold)&nbsp;&nbsp;&nbsp; [forward!](#forward)&nbsp;&nbsp;&nbsp; [get](#get)&nbsp;&nbsp;&nbsp; [goto!](#goto)&nbsp;&nbsp;&nbsp; [gt?](#gt)&nbsp;&nbsp;&nbsp; [gte?](#gte)&nbsp;&nbsp;&nbsp; [heading](#heading)&nbsp;&nbsp;&nbsp; [heading/vector](#heading/vector)&nbsp;&nbsp;&nbsp; [home!](#home)&nbsp;&nbsp;&nbsp; [inc](#inc)&nbsp;&nbsp;&nbsp; [inv](#inv)&nbsp;&nbsp;&nbsp; [inv/0](#inv/0)&nbsp;&nbsp;&nbsp; [inv/safe](#inv/safe)&nbsp;&nbsp;&nbsp; [join](#join)&nbsp;&nbsp;&nbsp; [keep](#keep)&nbsp;&nbsp;&nbsp; [keys](#keys)&nbsp;&nbsp;&nbsp; [keyword?](#keyword)&nbsp;&nbsp;&nbsp; [last](#last)&nbsp;&nbsp;&nbsp; [left!](#left)&nbsp;&nbsp;&nbsp; [list](#list)&nbsp;&nbsp;&nbsp; [list?](#list)&nbsp;&nbsp;&nbsp; [load\_turtle_state!](#load\_turtle_state)&nbsp;&nbsp;&nbsp; [lt!](#lt)&nbsp;&nbsp;&nbsp; [lt?](#lt)&nbsp;&nbsp;&nbsp; [lte?](#lte)&nbsp;&nbsp;&nbsp; [map](#map)&nbsp;&nbsp;&nbsp; [max](#max)&nbsp;&nbsp;&nbsp; [min](#min)&nbsp;&nbsp;&nbsp; [mod](#mod)&nbsp;&nbsp;&nbsp; [mod/0](#mod/0)&nbsp;&nbsp;&nbsp; [mod/safe](#mod/safe)&nbsp;&nbsp;&nbsp; [mult](#mult)&nbsp;&nbsp;&nbsp; [neg](#neg)&nbsp;&nbsp;&nbsp; [neg?](#neg)&nbsp;&nbsp;&nbsp; [neq?](#neq)&nbsp;&nbsp;&nbsp; [nil?](#nil)&nbsp;&nbsp;&nbsp; [not](#not)&nbsp;&nbsp;&nbsp; [odd?](#odd)&nbsp;&nbsp;&nbsp; [ok](#ok)&nbsp;&nbsp;&nbsp; [ok?](#ok)&nbsp;&nbsp;&nbsp; [omit](#omit)&nbsp;&nbsp;&nbsp; [or](#or)&nbsp;&nbsp;&nbsp; [ordered?](#ordered)&nbsp;&nbsp;&nbsp; [p5\_calls](#p5\_calls)&nbsp;&nbsp;&nbsp; [pc!](#pc)&nbsp;&nbsp;&nbsp; [pd!](#pd)&nbsp;&nbsp;&nbsp; [pencolor](#pencolor)&nbsp;&nbsp;&nbsp; [pencolor!](#pencolor)&nbsp;&nbsp;&nbsp; [pendown!](#pendown)&nbsp;&nbsp;&nbsp; [pendown?](#pendown)&nbsp;&nbsp;&nbsp; [penup!](#penup)&nbsp;&nbsp;&nbsp; [penwidth](#penwidth)&nbsp;&nbsp;&nbsp; [penwidth!](#penwidth)&nbsp;&nbsp;&nbsp; [pi](#pi)&nbsp;&nbsp;&nbsp; [pos?](#pos)&nbsp;&nbsp;&nbsp; [position](#position)&nbsp;&nbsp;&nbsp; [print!](#print)&nbsp;&nbsp;&nbsp; [pu!](#pu)&nbsp;&nbsp;&nbsp; [pw!](#pw)&nbsp;&nbsp;&nbsp; [rad/deg](#rad/deg)&nbsp;&nbsp;&nbsp; [rad/turn](#rad/turn)&nbsp;&nbsp;&nbsp; [random](#random)&nbsp;&nbsp;&nbsp; [random\_int](#random\_int)&nbsp;&nbsp;&nbsp; [range](#range)&nbsp;&nbsp;&nbsp; [render\_turtle!](#render\_turtle)&nbsp;&nbsp;&nbsp; [report!](#report)&nbsp;&nbsp;&nbsp; [reset\_turtle!](#reset\_turtle)&nbsp;&nbsp;&nbsp; [rest](#rest)&nbsp;&nbsp;&nbsp; [right!](#right)&nbsp;&nbsp;&nbsp; [round](#round)&nbsp;&nbsp;&nbsp; [rt!](#rt)&nbsp;&nbsp;&nbsp; [second](#second)&nbsp;&nbsp;&nbsp; [sentence](#sentence)&nbsp;&nbsp;&nbsp; [set](#set)&nbsp;&nbsp;&nbsp; [set?](#set)&nbsp;&nbsp;&nbsp; [show](#show)&nbsp;&nbsp;&nbsp; [sin](#sin)&nbsp;&nbsp;&nbsp; [slice](#slice)&nbsp;&nbsp;&nbsp; [some](#some)&nbsp;&nbsp;&nbsp; [some?](#some)&nbsp;&nbsp;&nbsp; [split](#split)&nbsp;&nbsp;&nbsp; [sqrt](#sqrt)&nbsp;&nbsp;&nbsp; [sqrt/safe](#sqrt/safe)&nbsp;&nbsp;&nbsp; [square](#square)&nbsp;&nbsp;&nbsp; [state](#state)&nbsp;&nbsp;&nbsp; [store!](#store)&nbsp;&nbsp;&nbsp; [string](#string)&nbsp;&nbsp;&nbsp; [string?](#string)&nbsp;&nbsp;&nbsp; [strip](#strip)&nbsp;&nbsp;&nbsp; [sub](#sub)&nbsp;&nbsp;&nbsp; [sum\_of_squares](#sum\_of_squares)&nbsp;&nbsp;&nbsp; [tan](#tan)&nbsp;&nbsp;&nbsp; [tau](#tau)&nbsp;&nbsp;&nbsp; [trim](#trim)&nbsp;&nbsp;&nbsp; [tuple?](#tuple)&nbsp;&nbsp;&nbsp; [turn/deg](#turn/deg)&nbsp;&nbsp;&nbsp; [turn/rad](#turn/rad)&nbsp;&nbsp;&nbsp; [turtle\_commands](#turtle\_commands)&nbsp;&nbsp;&nbsp; [turtle\_state](#turtle\_state)&nbsp;&nbsp;&nbsp; [turtle\_states](#turtle\_states)&nbsp;&nbsp;&nbsp; [type](#type)&nbsp;&nbsp;&nbsp; [unbox](#unbox)&nbsp;&nbsp;&nbsp; [unwrap!](#unwrap)&nbsp;&nbsp;&nbsp; [unwrap\_or](#unwrap\_or)&nbsp;&nbsp;&nbsp; [upcase](#upcase)&nbsp;&nbsp;&nbsp; [update](#update)&nbsp;&nbsp;&nbsp; [update!](#update)&nbsp;&nbsp;&nbsp; [values](#values)&nbsp;&nbsp;&nbsp; [words](#words)&nbsp;&nbsp;&nbsp; [ws?](#ws)&nbsp;&nbsp;&nbsp; [zero?](#zero)
 ## Function documentation
----
+
 ### abs
 Returns the absolute value of a number.
 ```
@@ -84,7 +87,6 @@ Returns the absolute value of a number.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### add
 Adds numbers or vectors.
@@ -97,7 +99,6 @@ Adds numbers or vectors.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### and
 Returns true if all values passed in are truthy. Note that this does not short-circuit: all arguments are evaulated before they are passed in.
@@ -109,7 +110,6 @@ Returns true if all values passed in are truthy. Note that this does not short-c
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### angle
 Calculates the angle between two vectors.
@@ -118,7 +118,6 @@ Calculates the angle between two vectors.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### any?
 Returns true if something is not empty, otherwise returns false (including for things that can't be logically full, like numbers).
@@ -132,7 +131,6 @@ Returns true if something is not empty, otherwise returns false (including for t
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### append
 Adds an element to a list or set.
@@ -145,7 +143,6 @@ Adds an element to a list or set.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### assert!
 Asserts a condition: returns the value if the value is truthy, panics if the value is falsy. Takes an optional message.
@@ -155,7 +152,6 @@ Asserts a condition: returns the value if the value is truthy, panics if the val
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### assoc
 Takes a dict, key, and value, and returns a new dict with the key set to value.
@@ -167,7 +163,6 @@ Takes a dict, key, and value, and returns a new dict with the key set to value.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### assoc?
 Returns true if a value is an associative collection: a dict or a pkg.
@@ -178,7 +173,6 @@ Returns true if a value is an associative collection: a dict or a pkg.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### at
 Returns the element at index n of a list or tuple, or the byte at index n of a string. Zero-indexed: the first element is at index 0. Returns nil if nothing is found in a list or tuple; returns an empty string if nothing is found in a string.
@@ -190,7 +184,6 @@ Returns the element at index n of a list or tuple, or the byte at index n of a s
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### atan/2
 Returns an angle from a slope. Takes an optional keyword argument to specify units. Takes either two numbers or a vector tuple.
@@ -204,7 +197,6 @@ Returns an angle from a slope. Takes an optional keyword argument to specify uni
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### back!
 Moves the turtle backward by a number of steps. Alias: bk!
@@ -213,7 +205,6 @@ Moves the turtle backward by a number of steps. Alias: bk!
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### background!
 Sets the background color behind the turtle and path. Alias: bg!
@@ -224,7 +215,6 @@ Sets the background color behind the turtle and path. Alias: bg!
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### between?
 Returns true if a number is in the range [lower, higher): greater than or equal to the lower number, less than the higher.
@@ -233,7 +223,6 @@ Returns true if a number is in the range [lower, higher): greater than or equal
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### bg!
 Sets the background color behind the turtle and path. Alias: bg!
@@ -244,12 +233,10 @@ Sets the background color behind the turtle and path. Alias: bg!
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### bgcolor
 No documentation available.
 
-
 ---
 ### bk!
 Moves the turtle backward by a number of steps. Alias: bk!
@@ -258,7 +245,6 @@ Moves the turtle backward by a number of steps. Alias: bk!
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### bool
 Returns false if a value is nil or false, otherwise returns true.
@@ -269,7 +255,6 @@ Returns false if a value is nil or false, otherwise returns true.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### bool?
 Returns true if a value is of type :boolean.
@@ -280,7 +265,6 @@ Returns true if a value is of type :boolean.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### box?
 Returns true if a value is a box.
@@ -290,7 +274,6 @@ Returns true if a value is a box.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### butlast
 Returns a list, omitting the last element.
@@ -299,7 +282,6 @@ Returns a list, omitting the last element.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### ceil
 Truncates a number towards positive infinity. With negative numbers, it returns the integer part. With positive numbers, returns the next more-positive integer.
@@ -308,7 +290,6 @@ Truncates a number towards positive infinity. With negative numbers, it returns
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### clear!
 Clears the canvas and sends the turtle home.
@@ -317,26 +298,22 @@ Clears the canvas and sends the turtle home.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### coll?
-Returns true if a value is a collection: dict, list, pkg, tuple, or set.
+Returns true if a value is a collection: dict, list, tuple, or set.
 ```
 (coll as :dict)
 (coll as :list)
 (coll as :tuple)
 (coll as :set)
-(coll as :pkg)
 (_)
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### colors
 No documentation available.
 
-
 ---
 ### concat
 Combines two lists, strings, or sets.
@@ -348,6 +325,14 @@ Combines two lists, strings, or sets.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
+---
+### contains?
+Returns true if a set or list contains a value.
+```
+(value, set as :set)
+(value, list as :list)
+```
+[Back to top.](#ludus-prelude-documentation)
 
 ---
 ### cos
@@ -360,7 +345,6 @@ Returns the cosine of an angle. Default angle measure is turns. An optional keyw
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### count
 Returns the number of elements in a collection (including string).
@@ -373,7 +357,6 @@ Returns the number of elements in a collection (including string).
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### dec
 Decrements a number.
@@ -382,7 +365,6 @@ Decrements a number.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### deg/rad
 Converts an angle in degrees to an angle in radians.
@@ -391,7 +373,6 @@ Converts an angle in degrees to an angle in radians.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### deg/turn
 Converts an angle in degrees to an angle in turns.
@@ -400,7 +381,6 @@ Converts an angle in degrees to an angle in turns.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### dict
 Takes a list or tuple of (key, value) tuples and returns it as a dict. Returns dicts unharmed.
@@ -411,7 +391,6 @@ Takes a list or tuple of (key, value) tuples and returns it as a dict. Returns d
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### dict?
 Returns true if a value is a dict.
@@ -421,7 +400,6 @@ Returns true if a value is a dict.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### diff
 Takes two dicts and returns a dict describing their differences. Does this shallowly, offering diffs only for keys in the original dict.
@@ -430,7 +408,6 @@ Takes two dicts and returns a dict describing their differences. Does this shall
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### dissoc
 Takes a dict and a key, and returns a new dict with the key and associated value omitted.
@@ -440,17 +417,15 @@ Takes a dict and a key, and returns a new dict with the key and associated value
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### dist
-Returns the distance from the origin to a point described by (x, y).
+Returns the distance from the origin to a point described by x and y, or by the vector (x, y).
 ```
 (x as :number, y as :number)
 ((x, y))
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### div
 Divides numbers. Panics on division by zero.
@@ -462,7 +437,6 @@ Divides numbers. Panics on division by zero.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### div/0
 Divides numbers. Returns 0 on division by zero.
@@ -474,7 +448,6 @@ Divides numbers. Returns 0 on division by zero.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### div/safe
 Divides a number. Returns a result tuple.
@@ -486,7 +459,6 @@ Divides a number. Returns a result tuple.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### doc!
 Prints the documentation of a function to the console.
@@ -496,7 +468,6 @@ Prints the documentation of a function to the console.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### downcase
 Takes a string and returns it in all lowercase. Works only for ascii characters.
@@ -505,18 +476,16 @@ Takes a string and returns it in all lowercase. Works only for ascii characters.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### each!
 Takes a list and applies a function, presumably with side effects, to each element in the list. Returns nil.
 ```
 (f! as :fn, [])
 (f! as :fn, [x])
-(f! as :fn, [...])
+(f! as :fn, [x, ...])
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### empty?
 Returns true if something is empty. Otherwise returns false (including for things that can't logically be empty, like numbers).
@@ -530,7 +499,6 @@ Returns true if something is empty. Otherwise returns false (including for thing
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### eq?
 Returns true if all arguments have the same value.
@@ -541,7 +509,6 @@ Returns true if all arguments have the same value.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### err
 Takes a value and wraps it in an :err result tuple, presumably as an error message.
@@ -550,7 +517,6 @@ Takes a value and wraps it in an :err result tuple, presumably as an error messa
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### err?
 Takes a value and returns true if it is an :err result tuple.
@@ -560,7 +526,6 @@ Takes a value and returns true if it is an :err result tuple.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### even?
 Returns true if a value is an even number, otherwise returns false.
@@ -570,7 +535,6 @@ Returns true if a value is an even number, otherwise returns false.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### false?
 Returns `true` if a value is `false`, otherwise returns `false`. Useful to distinguish between `false` and `nil`.
@@ -580,7 +544,6 @@ Returns `true` if a value is `false`, otherwise returns `false`. Useful to disti
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### fd!
 Moves the turtle forward by a number of steps. Alias: fd!
@@ -589,7 +552,6 @@ Moves the turtle forward by a number of steps. Alias: fd!
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### filter
 Takes a list and a predicate function, and returns a new list with only the items that produce truthy values when the function is called on them. E.g., `filter ([1, 2, 3, 4], odd?) &=> [1, 3]`.
@@ -598,7 +560,6 @@ Takes a list and a predicate function, and returns a new list with only the item
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### first
 Returns the first element of a list or tuple.
@@ -607,7 +568,6 @@ Returns the first element of a list or tuple.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### floor
 Truncates a number towards negative infinity. With positive numbers, it returns the integer part. With negative numbers, returns the next more-negative integer.
@@ -616,7 +576,6 @@ Truncates a number towards negative infinity. With positive numbers, it returns
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### fn?
 Returns true if an argument is a function.
@@ -626,7 +585,6 @@ Returns true if an argument is a function.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### fold
 Folds a list.
@@ -636,7 +594,6 @@ Folds a list.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### forward!
 Moves the turtle forward by a number of steps. Alias: fd!
@@ -645,7 +602,6 @@ Moves the turtle forward by a number of steps. Alias: fd!
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### get
 Takes a key, dict, and optional default value; returns the value at key. If the value is not found, returns nil or the default value.
@@ -656,7 +612,6 @@ Takes a key, dict, and optional default value; returns the value at key. If the
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### goto!
 Sends the turtle to (x, y) coordinates. If the pen is down, the turtle will draw a path to its new location.
@@ -666,7 +621,6 @@ Sends the turtle to (x, y) coordinates. If the pen is down, the turtle will draw
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### gt?
 Returns true if numbers are in decreasing order.
@@ -677,7 +631,6 @@ Returns true if numbers are in decreasing order.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### gte?
 Returns true if numbers are in decreasing or flat order.
@@ -688,7 +641,6 @@ Returns true if numbers are in decreasing or flat order.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### heading
 Returns the turtle's current heading.
@@ -697,7 +649,6 @@ Returns the turtle's current heading.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### heading/vector
 Takes a turtle heading, and returns a unit vector of that heading.
@@ -706,7 +657,6 @@ Takes a turtle heading, and returns a unit vector of that heading.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### home!
 Sends the turtle home: to the centre of the screen, pointing up. If the pen is down, the turtle will draw a path to home.
@@ -715,7 +665,6 @@ Sends the turtle home: to the centre of the screen, pointing up. If the pen is d
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### inc
 Increments a number.
@@ -724,7 +673,6 @@ Increments a number.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### inv
 Returns the inverse of a number: 1/n or `div (1, n)`. Panics on division by zero.
@@ -733,7 +681,6 @@ Returns the inverse of a number: 1/n or `div (1, n)`. Panics on division by zero
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### inv/0
 Returns the inverse of a number: 1/n or `div/0 (1, n)`. Returns 0 on division by zero.
@@ -742,7 +689,6 @@ Returns the inverse of a number: 1/n or `div/0 (1, n)`. Returns 0 on division by
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### inv/safe
 Returns the inverse of a number: 1/n or `div/safe (1, n)`. Returns a result tuple.
@@ -751,7 +697,6 @@ Returns the inverse of a number: 1/n or `div/safe (1, n)`. Returns a result tupl
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### join
 Takes a list of strings, and joins them into a single string, interposing an optional separator.
@@ -759,12 +704,11 @@ Takes a list of strings, and joins them into a single string, interposing an opt
 ([])
 ([str as :string])
 (strs as :list)
-([str], separator as :string)
+([str as :string], separator as :string)
 ([str, ...], separator as :string)
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### keep
 Takes a list and returns a new list with any `nil` values omitted.
@@ -773,7 +717,6 @@ Takes a list and returns a new list with any `nil` values omitted.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### keys
 Takes a dict and returns a list of keys in that dict.
@@ -782,7 +725,6 @@ Takes a dict and returns a list of keys in that dict.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### keyword?
 Returns true if a value is a keyword, otherwise returns false.
@@ -792,7 +734,6 @@ Returns true if a value is a keyword, otherwise returns false.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### last
 Returns the last element of a list or tuple.
@@ -801,7 +742,6 @@ Returns the last element of a list or tuple.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### left!
 Rotates the turtle left, measured in turns. Alias: lt!
@@ -810,16 +750,14 @@ Rotates the turtle left, measured in turns. Alias: lt!
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### list
-Takes a value and returns it as a list. For values, it simply wraps them in a list. For collections, conversions are as follows. A tuple->list conversion preservers order and length. Unordered collections do not preserve order. Associative collections return lists of (key, value) tuples.
+Takes a value and returns it as a list. For values, it simply wraps them in a list. For collections, conversions are as follows. A tuple->list conversion preservers order and length. Unordered collections do not preserve order: sets and dicts don't have predictable or stable ordering in output. Dicts return lists of (key, value) tuples.
 ```
 (x)
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### list?
 Returns true if the value is a list.
@@ -829,7 +767,6 @@ Returns true if the value is a list.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### load_turtle_state!
 Sets the turtle state to a previously saved state. Returns the state.
@@ -838,7 +775,6 @@ Sets the turtle state to a previously saved state. Returns the state.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### lt!
 Rotates the turtle left, measured in turns. Alias: lt!
@@ -847,7 +783,6 @@ Rotates the turtle left, measured in turns. Alias: lt!
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### lt?
 Returns true if numbers are in increasing order.
@@ -858,7 +793,6 @@ Returns true if numbers are in increasing order.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### lte?
 Returns true if numbers are in increasing or flat order.
@@ -869,7 +803,6 @@ Returns true if numbers are in increasing or flat order.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### map
 Maps a function over a list: returns a new list with elements that are the result of applying the function to each element in the original list. E.g., `map ([1, 2, 3], inc) &=> [2, 3, 4]`.
@@ -879,7 +812,6 @@ Maps a function over a list: returns a new list with elements that are the resul
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### max
 Returns the number in its arguments that is closest to positive infinity.
@@ -890,7 +822,6 @@ Returns the number in its arguments that is closest to positive infinity.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### min
 Returns the number in its arguments that is closest to negative infinity.
@@ -901,15 +832,32 @@ Returns the number in its arguments that is closest to negative infinity.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### mod
-Returns the modulus of num and div. Truncates towards negative infinity.
+Returns the modulus of num and div. Truncates towards negative infinity. Panics if div is 0.
 ```
+(num as :number, 0)
 (num as :number, div as :number)
 ```
 [Back to top.](#ludus-prelude-documentation)
 
+---
+### mod/0
+Returns the modulus of num and div. Truncates towards negative infinity. Returns 0 if div is 0.
+```
+(num as :number, 0)
+(num as :number, div as :number)
+```
+[Back to top.](#ludus-prelude-documentation)
+
+---
+### mod/safe
+Returns the modulus of num and div in a result tuple, or an error if div is 0. Truncates towards negative infinity.
+```
+(num as :number, 0)
+(num as :number, div as :number)
+```
+[Back to top.](#ludus-prelude-documentation)
 
 ---
 ### mult
@@ -924,7 +872,6 @@ Multiplies numbers or vectors.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### neg
 Multiplies a number by -1, negating it.
@@ -933,7 +880,6 @@ Multiplies a number by -1, negating it.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### neg?
 Returns true if a value is a negative number, otherwise returns false.
@@ -943,7 +889,6 @@ Returns true if a value is a negative number, otherwise returns false.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### neq?
 Returns true if none of the arguments have the same value.
@@ -954,7 +899,6 @@ Returns true if none of the arguments have the same value.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### nil?
 Returns true if a value is nil.
@@ -964,7 +908,6 @@ Returns true if a value is nil.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### not
 Returns false if a value is truthy, true if a value is falsy.
@@ -975,7 +918,6 @@ Returns false if a value is truthy, true if a value is falsy.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### odd?
 Returns true if a value is an odd number, otherwise returns false.
@@ -985,7 +927,6 @@ Returns true if a value is an odd number, otherwise returns false.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### ok
 Takes a value and wraps it in an :ok result tuple.
@@ -994,7 +935,6 @@ Takes a value and wraps it in an :ok result tuple.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### ok?
 Takes a value and returns true if it is an :ok result tuple.
@@ -1004,6 +944,13 @@ Takes a value and returns true if it is an :ok result tuple.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
+---
+### omit
+Returns a new set with the value omitted.
+```
+(value, s as :set)
+```
+[Back to top.](#ludus-prelude-documentation)
 
 ---
 ### or
@@ -1016,7 +963,6 @@ Returns true if any value passed in is truthy. Note that this does not short-cir
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### ordered?
 Returns true if a value is an indexed collection: list or tuple.
@@ -1027,12 +973,10 @@ Returns true if a value is an indexed collection: list or tuple.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### p5_calls
 No documentation available.
 
-
 ---
 ### pc!
 Changes the turtle's pen color. Takes a single grayscale value, an rgb tuple, or an rgba tuple. Alias: pc!
@@ -1043,7 +987,6 @@ Changes the turtle's pen color. Takes a single grayscale value, an rgb tuple, or
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### pd!
 Lowers the turtle's pen, causing it to draw. Alias: pd!
@@ -1052,7 +995,6 @@ Lowers the turtle's pen, causing it to draw. Alias: pd!
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### pencolor
 Returns the turtle's pen color as an (r, g, b, a) tuple.
@@ -1061,7 +1003,6 @@ Returns the turtle's pen color as an (r, g, b, a) tuple.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### pencolor!
 Changes the turtle's pen color. Takes a single grayscale value, an rgb tuple, or an rgba tuple. Alias: pc!
@@ -1072,7 +1013,6 @@ Changes the turtle's pen color. Takes a single grayscale value, an rgb tuple, or
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### pendown!
 Lowers the turtle's pen, causing it to draw. Alias: pd!
@@ -1081,7 +1021,6 @@ Lowers the turtle's pen, causing it to draw. Alias: pd!
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### pendown?
 Returns the turtle's pen state: true if the pen is down.
@@ -1090,7 +1029,6 @@ Returns the turtle's pen state: true if the pen is down.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### penup!
 Lifts the turtle's pen, stopping it from drawing. Alias: pu!
@@ -1099,7 +1037,6 @@ Lifts the turtle's pen, stopping it from drawing. Alias: pu!
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### penwidth
 Returns the turtle's pen width in pixels.
@@ -1108,7 +1045,6 @@ Returns the turtle's pen width in pixels.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### penwidth!
 Sets the width of the turtle's pen, measured in pixels. Alias: pw!
@@ -1117,12 +1053,10 @@ Sets the width of the turtle's pen, measured in pixels. Alias: pw!
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### pi
 No documentation available.
 
-
 ---
 ### pos?
 Returns true if a value is a positive number, otherwise returns false.
@@ -1132,7 +1066,6 @@ Returns true if a value is a positive number, otherwise returns false.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### position
 Returns the turtle's current position.
@@ -1141,7 +1074,6 @@ Returns the turtle's current position.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### print!
 Sends a text representation of Ludus values to the console.
@@ -1150,7 +1082,6 @@ Sends a text representation of Ludus values to the console.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### pu!
 Lifts the turtle's pen, stopping it from drawing. Alias: pu!
@@ -1159,7 +1090,6 @@ Lifts the turtle's pen, stopping it from drawing. Alias: pu!
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### pw!
 Sets the width of the turtle's pen, measured in pixels. Alias: pw!
@@ -1168,7 +1098,6 @@ Sets the width of the turtle's pen, measured in pixels. Alias: pw!
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### rad/deg
 Converts an angle in radians to an angle in degrees.
@@ -1177,7 +1106,6 @@ Converts an angle in radians to an angle in degrees.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### rad/turn
 Converts an angle in radians to an angle in turns.
@@ -1186,20 +1114,19 @@ Converts an angle in radians to an angle in turns.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### random
-Returns a random number. With zero arguments, returns a random number between 0 (inclusive) and 1 (exclusive). With one argument, returns a random number between 0 and n. With two arguments, returns a random number between m and n. Alternately, given a list, it returns a random member of that list.
+Returns a random something. With zero arguments, returns a random number between 0 (inclusive) and 1 (exclusive). With one argument, returns a random number between 0 and n. With two arguments, returns a random number between m and n. Alternately, given a collection (list, dict, set), it returns a random member of that collection.
 ```
 ()
 (n as :number)
 (m as :number, n as :number)
 (l as :list)
 (d as :dict)
+(s as :set)
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### random_int
 Returns a random integer. With one argument, returns a random integer between 0 and that number. With two arguments, returns a random integer between them.
@@ -1209,7 +1136,6 @@ Returns a random integer. With one argument, returns a random integer between 0
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### range
 Returns the set of integers between start (inclusive) and end (exclusive) as a list: [start, end). With one argument, starts at 0. If end is less than start, returns an empty list.
@@ -1219,7 +1145,6 @@ Returns the set of integers between start (inclusive) and end (exclusive) as a l
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### render_turtle!
 No docstring available.
@@ -1228,7 +1153,6 @@ No docstring available.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### report!
 Prints a value, then returns it.
@@ -1238,7 +1162,6 @@ Prints a value, then returns it.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### reset_turtle!
 Resets the turtle to its original state.
@@ -1247,7 +1170,6 @@ Resets the turtle to its original state.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### rest
 Returns all but the first element of a list or tuple, as a list.
@@ -1257,7 +1179,6 @@ Returns all but the first element of a list or tuple, as a list.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### right!
 Rotates the turtle right, measured in turns. Alias: rt!
@@ -1266,7 +1187,6 @@ Rotates the turtle right, measured in turns. Alias: rt!
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### round
 Rounds a number to the nearest integer.
@@ -1275,7 +1195,6 @@ Rounds a number to the nearest integer.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### rt!
 Rotates the turtle right, measured in turns. Alias: rt!
@@ -1284,7 +1203,6 @@ Rotates the turtle right, measured in turns. Alias: rt!
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### second
 Returns the second element of a list or tuple.
@@ -1293,7 +1211,6 @@ Returns the second element of a list or tuple.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### sentence
 Takes a list of words and turns it into a sentence.
@@ -1302,7 +1219,6 @@ Takes a list of words and turns it into a sentence.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### set
 Takes an ordered collection--list or tuple--and turns it into a set.
@@ -1312,7 +1228,6 @@ Takes an ordered collection--list or tuple--and turns it into a set.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### set?
 Returns true if a value is a set.
@@ -1322,7 +1237,6 @@ Returns true if a value is a set.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### show
 Returns a text representation of a Ludus value as a string.
@@ -1331,7 +1245,6 @@ Returns a text representation of a Ludus value as a string.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### sin
 Returns the sine of an angle. Default angle measure is turns. An optional keyword argument specifies the units of the angle passed in.
@@ -1343,7 +1256,6 @@ Returns the sine of an angle. Default angle measure is turns. An optional keywor
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### slice
 Returns a slice of a list, representing a sub-list.
@@ -1355,7 +1267,6 @@ Returns a slice of a list, representing a sub-list.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### some
 Takes a possibly nil value and a default value. Returns the value if it's not nil, returns the default if it's nil.
@@ -1365,7 +1276,6 @@ Takes a possibly nil value and a default value. Returns the value if it's not ni
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### some?
 Returns true if a value is not nil.
@@ -1375,7 +1285,6 @@ Returns true if a value is not nil.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### split
 Takes a string, and turns it into a list of strings, breaking on the separator.
@@ -1384,6 +1293,21 @@ Takes a string, and turns it into a list of strings, breaking on the separator.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
+---
+### sqrt
+Returns the square root of a number. Panics if the number is negative.
+```
+(x as :number)
+```
+[Back to top.](#ludus-prelude-documentation)
+
+---
+### sqrt/safe
+Returns a result containing the square root of a number, or an error if the number is negative.
+```
+(x as :number)
+```
+[Back to top.](#ludus-prelude-documentation)
 
 ---
 ### square
@@ -1393,12 +1317,10 @@ Squares a number.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### state
 No documentation available.
 
-
 ---
 ### store!
 Stores a value in a box, replacing the value that was previously there. Returns the value.
@@ -1407,7 +1329,6 @@ Stores a value in a box, replacing the value that was previously there. Returns
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### string
 Converts a value to a string by using `show`. If it is a string, returns it unharmed. Use this to build up strings of different kinds of values.
@@ -1418,7 +1339,6 @@ Converts a value to a string by using `show`. If it is a string, returns it unha
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### string?
 Returns true if a value is a string.
@@ -1428,7 +1348,6 @@ Returns true if a value is a string.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### strip
 Removes punctuation from a string, removing all instances of ,.;:?!
@@ -1443,7 +1362,6 @@ Removes punctuation from a string, removing all instances of ,.;:?!
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### sub
 Subtracts numbers or vectors.
@@ -1456,7 +1374,6 @@ Subtracts numbers or vectors.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### sum_of_squares
 Returns the sum of squares of numbers.
@@ -1468,7 +1385,6 @@ Returns the sum of squares of numbers.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### tan
 Returns the sine of an angle. Default angle measure is turns. An optional keyword argument specifies the units of the angle passed in.
@@ -1480,12 +1396,10 @@ Returns the sine of an angle. Default angle measure is turns. An optional keywor
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### tau
 No documentation available.
 
-
 ---
 ### trim
 Trims whitespace from a string. Takes an optional argument, `:left` or `:right`, to trim only on the left or right.
@@ -1496,7 +1410,6 @@ Trims whitespace from a string. Takes an optional argument, `:left` or `:right`,
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### tuple?
 Returns true if a value is a tuple.
@@ -1506,7 +1419,6 @@ Returns true if a value is a tuple.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### turn/deg
 Converts an angle in turns to an angle in degrees.
@@ -1515,7 +1427,6 @@ Converts an angle in turns to an angle in degrees.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### turn/rad
 Converts an angle in turns to an angle in radians.
@@ -1524,12 +1435,10 @@ Converts an angle in turns to an angle in radians.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### turtle_commands
 No documentation available.
 
-
 ---
 ### turtle_state
 Returns the turtle's current state.
@@ -1538,12 +1447,10 @@ Returns the turtle's current state.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### turtle_states
 No documentation available.
 
-
 ---
 ### type
 Returns a keyword representing the type of the value passed in.
@@ -1552,7 +1459,6 @@ Returns a keyword representing the type of the value passed in.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### unbox
 Returns the value that is stored in a box.
@@ -1561,7 +1467,6 @@ Returns the value that is stored in a box.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### unwrap!
 Takes a result tuple. If it's :ok, then returns the value. If it's not :ok, then it panics. If it's not a result tuple, it also panics.
@@ -1572,7 +1477,6 @@ Takes a result tuple. If it's :ok, then returns the value. If it's not :ok, then
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### unwrap_or
 Takes a value that is a result tuple and a default value. If it's :ok, then it returns the value. If it's :err, returns the default value.
@@ -1582,7 +1486,6 @@ Takes a value that is a result tuple and a default value. If it's :ok, then it r
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### upcase
 Takes a string and returns it in all uppercase. Works only for ascii characters.
@@ -1591,7 +1494,6 @@ Takes a string and returns it in all uppercase. Works only for ascii characters.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### update
 Takes a dict, key, and function, and returns a new dict with the key set to the result of applying the function to original value held at the key.
@@ -1601,7 +1503,6 @@ Takes a dict, key, and function, and returns a new dict with the key set to the
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### update!
 Updates a box by applying a function to its value. Returns the new value.
@@ -1610,7 +1511,6 @@ Updates a box by applying a function to its value. Returns the new value.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### values
 Takes a dict and returns a list of values in that dict.
@@ -1619,7 +1519,6 @@ Takes a dict and returns a list of values in that dict.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### words
 Takes a string and returns a list of the words in the string. Strips all whitespace.
@@ -1628,7 +1527,6 @@ Takes a string and returns a list of the words in the string. Strips all whitesp
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### ws?
 Tells if a string is a whitespace character.
@@ -1640,7 +1538,6 @@ Tells if a string is a whitespace character.
 ```
 [Back to top.](#ludus-prelude-documentation)
 
-
 ---
 ### zero?
 Returns true if a number is 0.