[MRG] refactor MinHash.downsample #1458
Merged
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I started writing a guide to testing in sourmash, and I was using #1448 as an example and then I realized that the code was terrible. So I decided to refactor it before using it as an example 😆 .
This PR makes the guards in
MinHash.downsample(...)
much clearer and more explicit, and adds some docs.Please wait for tests to pass before merging as I want to see the code coverage to make sure I got all the branches!