Comment on Speedup from switch to +=parentComments−desmond3734yMight be platform dependent whether that first line counts as a mutate or not, seeing as it can be converted to not do anything in some cases.−mgraczyk4yAll of the lines that have += mutate x in place−maweki4yUnless x is immutable, in which case the semantics of both variants agree.
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Might be platform dependent whether that first line counts as a mutate or not, seeing as it can be converted to not do anything in some cases.
All of the lines that have += mutate x in place
Unless x is immutable, in which case the semantics of both variants agree.