Requiring `respondWithFile()` to only work with regular files
is an artificial restriction on Node’s side and has become unnecessary.
Offsets or lengths cannot be specified for those files,
but that is an inherent property of other file types.
PR-URL: https://github.com/nodejs/node/pull/18936
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
