[racket] Modular arithmetic

From: Erich Rast (erich at snafu.de)
Date: Thu Dec 20 09:49:19 EST 2012

Hi,

For compatibility I need modular arithmetic for some
standard numeric types such as signed 64bit integer, unsigned 64bit
integer, signed 32 bit integer, and so on. Preferably it shouldn't be
very slow.

What's the best way to get this? Is there a package for this already?

Best,

Erich

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