Currently some docstrings use "sequence of float" ("sequence of scalar", etc.) and others use "1D array-like" ("1d array-like", "array-like"). We could try to stick to one form (my preference would be "1d array-like" (implicitly floats), "1d int array-like", etc. (lowercase "d")).

attn@timhoffm who has been doing a lot of docstring homogeneization/policy recently :-)