string split documentation unclear

[tml]

Documentation

If sep is not specified or is None and maxsplit is 0, only leading runs of consecutive whitespace are considered. This is contrary to (or, at least, underspecified in) the current documentation.

Linked PRs

• gh-133986: Document string split algorithm when sep is None and maxsplit is 0 #133987
• [3.13] gh-133986: Document string split algorithm when sep is None and maxsplit is 0 (GH-133987) #133992
• [3.14] gh-133986: Document string split algorithm when sep is None and maxsplit is 0 (GH-133987) #133993