Allow iterator adaptors to be used as standalone functions #404
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Backport of e2bf2b5 The instance checks in the `iterator` module use `KValue::is_iterable` to decide whether or not to accept the instance provided to the call. When used as standalone functions, adaptors like `iterator.enumerate(1..10)` were accepting the `iterator` module causing an error to be thrown. The fix is to extend the `is_iterable` logic to only accept object-like maps if they implement `@iterator` or `@next`.
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Backport of e2bf2b5 for
0.15.1.See #401.