perf: avoid split() when locating lines - #338
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getLocatorsplit the whole source into an array of lines just to compute line offsets, andMappings.advancesplit every intro, outro and edit to count newlines. Both now useindexOfand keep only the offsets and counts. Output is unchanged;pnpm benchon this machine movesgenerateDecodedMap (no edit)from 2,269 to 2,426 hz, the rest is within noise.