Antonio Sanchez 42acbd5700 Fix numext::arg return type.
The cxx11 path for `numext::arg` incorrectly returned the complex type
instead of the real type, leading to compile errors. Fixed this and
added tests.

Related to !477, which uncovered the issue.


(cherry picked from commit 90e9a33e1ce3e4e7663dd67e6c1f225afaf5c206)
2021-05-07 17:52:07 +00:00
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