what happens

the remote dataset loader leaks a full temp file on every cache=False fetch. _fetch_from_url writes the downloaded dataset into a NamedTemporaryFile(delete=False) and then abandons the handle without closing or deleting it, so each non-cached fetch strands a complete copy of the dataset in the temp directory.

this is the same bug class the maintainers already fixed for save_formatted_audio in #1894.

expected

the temp file is cleaned up when the fetch path is done with it (context-managed handle, or explicit close plus unlink in a finally), matching the #1894 fix pattern.

env: main 5503ecb