Split marshal into passStyleOf and marshal

[erights]

Almost purely internal cleanup.

I moved sameValueZero to same-structure package, which is the only place it is used. I don't even export it from there. I may reverse this before merging.

[erights]

@michaelfig when you review this, could you also let us know here what we should do to make this dapp-card-store CI error go away? Thanks.

[michaelfig]

LGTM!

I did not go over the code copying with a fine-toothed comb. If you changed any semantics in it, I'd like to know what that was so I can check it more carefully.

[erights]

I did not go over the code copying with a fine-toothed comb. If you changed any semantics in it, I'd like to know what that was so I can check it more carefully.

One. As the PR comment says

I moved sameValueZero to same-structure package, which is the only place it is used. I don't even export it from there. I may reverse this before merging.

I looked again and confirmed that the only semantic change is moving sameValueZero from the marshal to the sameStructure package, where it is not exported. This is technically a breaking change, but doesn't seem to break anything because it really seems nothing is using it. But since it is technically a breaking change, I'd like your opinion on this specifically before merging. Thanks.

[michaelfig]

Yes, the sameValueZero change is fine!