speedup normalizeIgnoredCharacters when no chars are ignored #331
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While investigating #330, I noticed a quick optimization for
normalizeIgnoredCharacters(~7% CPU usage in Chrome profiler). We could simplyreturn "" if ignoredChars === "", as that is what will be returned anyways if the function were to continue. Quick benchmarks states that it speeds up the function by > 50x in this case, with no impact on other cases.Here is the benchmark info:
https://jsperf.com/rangy-normalizeignoredcharacters