[issue10534] difflib.SequenceMatcher: expose junk sets, deprecate undocumented isb... functions.

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

Added tweak to .__chain_b to avoid creating list of b2j.keys and .items be deleting from b2j in separate loop after creating sets. Test with timeit suggests time about same with 1% deletion. r87276

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resolution:  -> fixed
status: open -> closed

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