[issue24904] Provide a way for potentially long runtime difflib algorithms to be aborted by the caller (and report progress?)

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[issue24904] Provide a way for potentially long runtime difflib algorithms to be aborted by the caller (and report progress?)

Gregory P. Smith added the comment: The way I'd go about this is to support some form of periodic checkpoint in the algorithm where it checks in with code supplied by the difflib user. Traditionally that'd have been via callbacks, there might be an async style way to express that these days.