doc: increase Buffer.concat() documentation

This commit adds documentation for two edge cases in Buffer.concat(). Those cases are: - totalLength is specified, but is not an integer. - The combined buffer length is greater than totalLength. PR-URL: nodejs#11845 Fixes: nodejs#11605 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Joyee Cheung <[email protected]> Reviewed-By: Luigi Pinca <[email protected]>
jungx098 · Mar 21, 2017 · e2e5407 · e2e5407
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commit e2e5407
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diff --git a/doc/api/buffer.md b/doc/api/buffer.md
@@ -755,6 +755,10 @@ in `list`. This however causes an additional loop to be executed in order to
 calculate the `totalLength`, so it is faster to provide the length explicitly if
 it is already known.
 
+If `totalLength` is provided, it is coerced to an unsigned integer. If the
+combined length of the `Buffer`s in `list` exceeds `totalLength`, the result is
+truncated to `totalLength`.
+
 Example: Create a single `Buffer` from a list of three `Buffer` instances
 
 ```js