Reacquire GIL before constructing tuples containing numpy arrays. #566
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... as explicitly required by pybind11. Compile with
#define PYBIND11_ASSERT_GIL_HELD_INCREF_DECREF
to observe GIL assertion failures in absence of this patch.Closes (and supersedes) #564.
(See item regarding "pybind11 objects that are members of other C++ structures" in https://pybind11.readthedocs.io/en/stable/advanced/misc.html#common-sources-of-global-interpreter-lock-errors)