I just used fetch-blob in one of my projects and I noticed in snapshot tests that the string representation of the File class here is simplified in contrast to the native one:

It seems to be deliberate, as there is a test covering it:

The way the snapshot tests representations are constructed are not from .toString() but from what is usually printed in the console: https://github.com/denoland/std/blob/b213d54732282e3f635fd7e3535348b3af92e4c2/testing/snapshot.ts#L215-L226

I am not completely sure yet, where to start, as I previously had assumed string representation to be always the same as .toString() but I was wondering if you'd consider accepting a change that would keep the current behaviour for .toString() but changes it for a console print, similar to what Chrome does:

which I am assuming would be what Deno.inspect would do as well.