How should Access Handle read() deal with file modifications?

[fivedots]

This issue was originally discussed here: https://github.com/whatwg/fs/pull/21/files/0cff51afca4e80753bf7b38bdf8c62c1ee37ffd9#r860572377

The question is, how should user agents react when there is an active access handle attached to a file, and that file is modified by an external process (e.g. the user runs rm -rf on the storage profile while the browser is running)? This case is currently a TODO in the Access Handles spec.