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fma using BigFloats on Sys.iswindows() #49

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fma using BigFloats on Sys.iswindows() #49

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fma using BigFloats on Sys.iswindows()
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adjust BigFloat precision for Sys.windows() fma
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@JeffreySarnoff
for fma, setprecision(BigFloat,113)
6d6e1ba 
After much consideration and some testing, since we are using MPFR's `fma`, it is appropriate to use 113 bits of precision.  FMA implementations (even on chip) do not really evaluate as if infinite bits of precision were available.
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@simonbyrne ^

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