numpy/numpy — pull request #4788 by jaimefrio (2014-06-06 23:58:50+00:00)
Title: BUG: Correct behavior for lists of tuples in unique, closes #4785

`np.unique` produces wrong results when passed a list of tuples and
no keyword arguments, as it fails to recognize it as a multidim
array, but handles it as a 1D array of objects. The only way around
this seems to be to completely eliminate the fast path for non-array
inputs using `set`.