Removed all allocs from Hypercore's proof code. The API is now madness though; wonder how we could do better. https://github.com/datrs/tree-index/commit/4c60b941eecc9a80ed90fede1fe691787d23eb7c …
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true -- which you might want to explicitly document somewhere if you haven't already? :) the format you can probably just omit, not sure how valuable that error message is. otoh, it's a cold path in a `panic!`
