[FEATURE] Send Files or Bytes through ports

[decioferreira]

Is your feature request related to a problem? Please describe.

From https://elmlang.slack.com/archives/C0CJ3SBBM/p1762178135113389

I am trying to load and play a local video file in the browser. Since my files can be large (gigas of them bytes), I would rather not use File.toUrl and rather use the URL.createObjectURL api of the browser. However, I can't send File objects through ports. Any better way to do that?
Edit: Bytes is also not transferable across ports.

Additional context

This feature seems to exist in lamdera. Related commits/issues:

• lamdera/compiler@406f3fb
• lamdera/compiler@58ae741
• Bytes flag causes Map.! error lamdera/compiler#26

There is also an issue in elm about this: elm#2313

Update

#137 implements sending Bytes through flags and ports.

[rupertlssmith]

Taking a look at this but just the Bytes part, not the Files part.