Remove `HashType::Unknown`#5

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Ericson2314 merged 20 commits intogit-objects-developfrom

git+no-hash-type-unknown

Jun 2, 2020

Commits on Mar 29, 2020

Use `enum struct` and drop prefixes
Ericson2314
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Commits on May 28, 2020

Commits on May 30, 2020

Commits on Jun 2, 2020