timestamp: make saturating arithmetic panic for non-uniform units #46
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The saturating methods should return an error. But I goofed on the
API. So at this point, our two choices are: leave it as-is, which
produces completely incorrect results when there are non-zero units of
days or greater, or panic when it occurs. I think a panic is better.
In Jiff 0.2, these APIs will be made fallible. And hopefully by then
we'll have truly infallible APIs that accept an "absolute" duration.
Partially addresses #36