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buffer: document concat zero-fill
PR-URL: #55562 Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de> Reviewed-By: Ulises Gascón <ulisesgascongonzalez@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Jason Zhang <xzha4350@gmail.com>
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doc/api/buffer.md

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@@ -1041,7 +1041,8 @@ in `list` by adding their lengths.
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If `totalLength` is provided, it is coerced to an unsigned integer. If the
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combined length of the `Buffer`s in `list` exceeds `totalLength`, the result is
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truncated to `totalLength`.
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truncated to `totalLength`. If the combined length of the `Buffer`s in `list` is
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less than `totalLength`, the remaining space is filled with zeros.
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```mjs
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import { Buffer } from 'node:buffer';

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