Want to know why "prop in obj" is slower than "obj.prop !== undefined" in SpiderMonkey? Great overview by @bz_moz: https://lists.mozilla.org/pipermail/dev-tech-js-engine-internals/2014-July/001858.html …
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@bz_moz@fitzgen@angelinamagnum agree totally, and love your insight. Just wanted to add a note of caution for people who do a blanket swap -
@angustweets@fitzgen@angelinamagnum Oh, God, yes. Please do NOT use microbenchmark results to blanket-swap things!
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