Should numpy.sqrt(-1) return 1j rather than nan?

[Greg Willden]

May I suggest the following change to generate_umath.py?

<completely untested string change>
'sqrt' :
    Ufunc(1, 1, None,
          'square-root elementwise. For real x, the domain is restricted to
x>=0.\n\
          For complex results for x<0 see numpy.scimath.sqrt',
          TD(inexact, f='sqrt'),
          TD(M, f='sqrt'),
          ),
'

When sqrt throws a ValueError would it be possible/appropriate for the error
message to mention numpy.scimath.sqrt?

I'm just trying to think of other ways to help make the transition as smooth
as possible for new users.

Greg
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