Comment #11 on issue 1434 by ondrej.certik: substitution doesn't work for  
sqrt()
http://code.google.com/p/sympy/issues/detail?id=1434

These tests are not a nonsense, those tests are there to check that it is  
fast enough
for big numbers.

Ok, you are right that (-9)**Rational(3,2) is wrong with my patch. How is  
it that it
is not tested for? We need to greatly improve our testsuite for this.

So let's fix it the way you started, but could you please comment the code?  
I really
don't understand what it is doing.

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