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@PeterJones sure.
@Kjell-Rilbe, @PeterJones:
Try:
This is one of those cases where it’s much less confusing to skip what you don’t want to match than to try to specify what you do want to match.
@Pawan-Sharma If I had to guess, two words: race conditions (and an opposite-ish problem, deadlocks). Iteratively updating the results while searching seems like a great way to introduce endless difficult-to-reproduce bugs.