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doc: clarify the behavior of Buffer.byteLength · nodejs/node@e1e02ef · GitHub

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seishun
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MylesBorins
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doc: clarify the behavior of Buffer.byteLength
PR-URL: #11238 Refs: #11165 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: Michaël Zasso <targos@protonmail.com>
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‎doc/api/buffer.md‎

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@@ -528,6 +528,10 @@ Returns the actual byte length of a string. This is not the same as
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[`String.prototype.length`][] since that returns the number of *characters* in
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a string.
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*Note* that for `'base64'` and `'hex'`, this function assumes valid input. For
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strings that contain non-Base64/Hex-encoded data (e.g. whitespace), the return
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value might be greater than the length of a `Buffer` created from the string.
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Example:
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```js

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