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buffer: optimize byteLength for short strings

Rodrigo Muino Tomonari requested to merge github/fork/nxtedition/bytelength-int64 into main

M2

buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='utf8' type='four_bytes'                  5.08 %      ±27.63% ±43.80%  ±75.96%
buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='utf8' type='one_byte'                    9.92 %      ±43.25% ±67.27% ±112.98%
buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='utf8' type='three_bytes'                12.47 %      ±31.61% ±49.92%  ±86.02%
buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='utf8' type='two_bytes'                  34.02 %      ±52.38% ±76.67% ±116.30%
buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='utf8' type='four_bytes'          **     82.80 %      ±52.56% ±76.65% ±115.59%
buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='utf8' type='one_byte'                    5.31 %      ±48.31% ±70.43% ±106.17%
buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='utf8' type='three_bytes'         **     60.17 %      ±34.55% ±50.81%  ±77.68%
buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='utf8' type='two_bytes'           **     68.52 %      ±32.32% ±48.53%  ±76.85%

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