Previously new-style wrappers were implied by the function being a generator, however that broke a use case of a non-wrapper impl being a generator as a way to return an Iterator result. This is legitimate, and used at least by conda (see #403).
Therefore, change to require an explicit wrapper=True. Also adds a test for the iterator-returning case.
Previously new-style wrappers were implied by the function being a generator, however that broke a use case of a non-wrapper impl being a generator as a way to return an Iterator result. This is legitimate, and used at least by conda (see #403).
Therefore, change to require an explicit
wrapper=True. Also adds a test for the iterator-returning case.Fix #405.