sha,message,author_date,committer_date,raw_author,raw_committer,repo,author,committer
69086b332c6c950587830b266df4e624c2106d89,"Fix maybe_promote (#1953)

* Fix maybe_promote

With tests for every possible dtype:

(numpy docs say `biufcmMOSUV` only)

```
for letter in string.ascii_letters:
    try:
        print(letter, np.dtype(letter))
    except TypeError as exc:
        pass
```

* Check issubdtype of floating before timedelta64

In order to hit this branch more often

* Improve maybe_promote test",2018-08-20T16:31:15Z,2018-08-20T16:31:15Z,0932899d57e04ca5af02e127ec7d787c71e006cc,f10b21bed2846b879806f87039b77245b18e7671,13221727,1997005,1217238