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This fixes a zero-looping bug in
raw-approx-cr.raw-approx-cris supposed find a minimal approximation for use in arithmetic functions. It does this by adding precision until the absolute-value of the approximation is greater 4. Unfortunately, for zero, it had no threshold to stop making approximations with increasing precision, causing it to loop infinitely.Even with the fix, approximation and comparison are inherently inexact with computable-reals, which means that
raw-approx-crand other functions have behavior that should be addressed. I'll make a separate issue for it.