Consider removing Sum or moving it to a subpackage about go-multihash HOT 5 CLOSED

In principle, I agree. Given the number of dependencies on this package, we'd probably just create a new go-multihash-format package and create a bunch of type aliases.

However, we probably won't get around to doing this any time soon.

(although having something other than Sum really would be nice)

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Also consider that Sum will never be enough: code that hashes data might want to reuse hash objects, write to them as a stream, etc.

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Went looking for this and realized it was closed. This isn't fixed.

We should:

1. Stop checking for "valid" codes. There's no reason to reject unknown codes.
2. Move the core logic to a separate module.

That way, people can depend on the types when they don't really need to be able to hash things.

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Visiting for triage, I'm closing this in favor of a new issue that succinctly describes the change we'd accept.

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(the issue: #131)

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