(maint) Add doc stub for 4x function assert_type
(maint) Add 3x function doc stub for 4x function each
(maint) Add 3x function doc stub for 4x function filter
(maint) Add 3x doc function stub for 4x function map
(maint) Add 3x function doc stub for 4x function match
(maint) Add 3x function doc stub for 4x function reduce
(maint) Add 3x function doc stub for 4x function slice
(maint) Update function 'with's documentation with an example
(maint) Add 3x function doc stub for 4x function with