one useful side effect of writing a git clone is I can make it write deliberate malformed commits and see how git handles them. some findings: - commits must have a `tree` field - commits may lack an `author` or `committer` field
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(this is a reason I'm mad about how Ord works: commits have multiple senses in which they're ordered -- you can order by their timestamp (total order), or by their causal position in the history graph (partial order))
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That seems like a fundamentally different thing than what `Ord` represents though. If you want to use something as a key for a BTreeMap, there needs to be one canonical ordering. Business logic doesn't have to conform to a generic trait
