inikulin / parse5 / 22768536541

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perf(tokenizer): use String.fromCharCode for BMP characters (#1680)

Use String.fromCharCode() instead of String.fromCodePoint() for BMP
characters (code points < 0x10000) in _emitCodePoint(). This provides
a small performance improvement since fromCharCode is simpler and
doesn't need to handle surrogate pairs.

Characters outside the BMP are rare in HTML content, so the fallback
to fromCodePoint is seldom needed.

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