Comment #2 on issue 2061 by smichr: sqrt(-1.0*x) gives infinite recursion http://code.google.com/p/sympy/issues/detail?id=2061
Maybe overkill. If all tests pass with just treating leading Rationals rather than Numbers then perhaps that's enough of a change. The only nuance is that whereas -pi*x has -1 as args[0], -3.0*x has -3.0 as args[0], but that is easy to handle so both give -1 as the coefficient for as_coeff_terms.
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