[Numpy-discussion] BUG: ndarray subclass calls __mul__ when ** (pow) is involved

[Dmitrey]

 I have ndarray subclass, its instance x and use
   r = x**2

   I expected it will call for each array element
   elem.__pow__(2)
   but it calls
   elem.__mul__(elem)
   instead.

   It essentially (tens or even more times) decreases my calculations
   speed for lots of cases.

   >>> numpy.__version__
   '2.0.0.dev-1fe8136'
   (taken some days ago from git)
   doesn't work with 1.3.0 as well..
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