ENH: Add support for argstr formatting of any iterable #614
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See #613 for context. I looked at the code path @effigies suggested where the fix should be implemented.
This PR should facilitate composition of interfaces producing and consuming iterable types, not just lists. Sets and tuples provide additional guarantees which are quite nice, such as uniqueness and size boundness respectively. Since strings and bytes also satisfy the
Iterable
protocol in Python, these need to be discarded explicitly in the instance type check.Closes #613