feat: add all File WPTs

[KhafraDev]

• Fixes bug when using boxed primitives, for example: new File([new String('bits')], 'dummy')
• Fixes bug where null/undefined values would try to be converted to a webidl dictionary, causing an error.

After this I don't think there's any reason not to make File a global in node?

+95 tests, no failures. All test files are from https://github.com/web-platform-tests/wpt/tree/master/FileAPI/file

p.s. sorry for all the PRs lately

[mcollina]

lgtm

[mcollina]

After this I don't think there's any reason not to make File a global in node?

No, let's do it.

[KhafraDev]

if it is made a global, should FileReader also be implemented?

[mcollina]

I think we should implement that interface anyway.

[jimmywarting]

I don't think the FileReader is necessary. We have read methods on the blob itself

I consider it to be kind of legacy now

[KhafraDev]

I think adding it is good for the same reason that btoa and atob were added: browser (& deno) compatibility. It was insanely easy to implement too.

It also allows us to enable the idlharness for File (the alternative is disabling ~100 tests) which allowed me to find 2 minor bugs in the File implementation. It also prevents regressions in the future, which is great.