Clarification regarding generators

[cognivore]

Oddly enough, both generators in the documentations and the generator I've seen in Maybe are ignoring their argument and use Enum.random().

This seems to be an anti-pattern in property-based testing because it relies on reproducibility of a random test that caught an error.

I assume that the underlying plumbing somehow sets a global seed for Enum.random(), perhaps mix test even does it itself (hence "Randomized with seed NNN" messages at the end of the tests), but in my opinion a clarification is required here.

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