util: optimize toASCIILower function using V8s native toLowerCase · nodejs/node@09b5396 · GitHub

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mertcanaltin

authored and

RafaelGSS

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util: optimize toASCIILower function using V8s native toLowerCase

PR-URL: #61107 Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com> Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

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‎lib/internal/mime.js‎

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Original file line number	Diff line number	Diff line change
@@ -23,6 +23,8 @@ const END_BEGINNING_WHITESPACE = /[^\r\n\t ]|$/;
23	23	const START_ENDING_WHITESPACE = /[\r\n\t ]*$/;
24	24
25	25	function toASCIILower(str) {
	26	+ // eslint-disable-next-line no-control-regex
	27	+ if (!/[^\x00-\x7f]/.test(str)) return StringPrototypeToLowerCase(str);
26	28	let result = '';
27	29	for (let i = 0; i < str.length; i++) {
28	30	const char = str[i];

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