[issue40394] difflib.SequenceMatcher.find_longest_match default arguments

[Tim Peters]

Tim Peters <tim at python.org> added the comment:

Sounds good to me, Lewis - thanks!  Note, though, that alo and blo should default to 0.  `None` is best reserved for cases where the default value needs to be computed at runtime.  But alo == blo == 0 apply to all possible instances.

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