core: speed up large paste parsing - #1302
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Bracketed paste spent excess time in a naive byte scan and in Uint8Array.from copies. Use Buffer.indexOf and a direct set-based copy, and add a phase benchmark to track parser and editor cost.
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Bracketed paste spent excess time in a naive byte scan and in
Uint8Array.from copies. Use Buffer.indexOf and a direct set-based
copy, and add a phase benchmark to track parser and editor cost.