[racket] 80-bit precision in Racket

Hendrik,

> Is it conceivable that you need multiple-precision fixed-point?

If would be OK in terms of numerical accuracy, but
I feel that it would not be good in terms of performance.

See the description for Neil Toronto's interface to MPFR:
https://github.com/ntoronto/racket/blob/master/collects/math/scribblings/math-bigfloat.scrbl

"Bigfloat functions can be hundreds to thousands of times slower than
flonum functions."

Best regards,

Dmitry