Consider generalizing Url.createObjectURL to blob_like

[ghost]

I'm using

  external asFile: Webapi.Blob.t => Webapi.File.t = "%identity"

to work around the createObjectURL requiring a File.t. Consider generalizing createObjectURL in the future. Thanks.

[TheSpyder]

For the moment that's just what we imported from bs-webapi. Our aim is to retain compatibility where possible for 1.0 because a lot of people will suddenly need to migrate when ReScript 10 is released.

Thank you for the idea. I'm tracking ways to improve the Fetch API in #30 - I'll add a note there. This isn't specifically fetch related, but it's fairly close and I think the opportunity for a breaking change is a good time to do it.