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The fs validation ladder and the callback dispatch check their options
argument as Node's getOptions does. null, undefined and functions take
the defaults, and a string is the encoding. Numbers, booleans, bigints
and symbols throw ERR_INVALID_ARG_TYPE ('The "options" argument must be
one of type string or object'). assertEncoding lets 'buffer' through;
before, every 'buffer' encoding threw ERR_INVALID_ARG_VALUE.
With 'buffer':
- readFile and readFileSync read the file first, so a missing file
reports ENOENT. Then buffer.toString('buffer') throws
ERR_UNKNOWN_ENCODING; an empty file answers "".
- fs.mkdtemp's callback receives the path as a Buffer.
- mkdtempSync, opendirSync, createReadStream and createWriteStream
throw the fence error.
fs.mkdtemp's callback form now checks its encoding. It also returns its
path in the requested encoding: re-encoded text for names other than
utf8, as the binding does.
Corpus 5545 covers these forms against Node 24.22.