doc: clarify the behavior of Buffer.byteLength

PR-URL: #11238 Refs: #11165 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Michaël Zasso <[email protected]>
nodejs · Mar 9, 2017 · e1e02ef · e1e02ef
1 parent 30d9202
commit e1e02ef
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diff --git a/doc/api/buffer.md b/doc/api/buffer.md
@@ -528,6 +528,10 @@ Returns the actual byte length of a string. This is not the same as
 [`String.prototype.length`][] since that returns the number of *characters* in
 a string.
 
+*Note* that for `'base64'` and `'hex'`, this function assumes valid input. For
+strings that contain non-Base64/Hex-encoded data (e.g. whitespace), the return
+value might be greater than the length of a `Buffer` created from the string.
+
 Example:
 
 ```js