Flatten

[bonega]

Not really that valuable spec. Perhaps of use in a future with a context-aware IDE

[borkdude]

@bonega Thanks for your contribution. According to the docs of flatten it takes a nested sequential thing, so I think we should not accept ::ss/any, but (s/nilable :ss:/sequential). E.g. I don't want to see flatten in these results: https://re-find.it/?args=1.

As for the test: the other tests follow the pattern:

• example based tests
• check (if possible, this will do a generative test, useful for finding edge cases that we didn't think about before)
• is caught? tests: check if the spec throws on input that the function should not accept.

Can you complete the test like this? I'll document this pattern in the style guide.