[racket] Low level manipulation on numbers

Dear all,

I am trying to write a small implementation of Protocol Buffers (
http://code.google.com/p/protobuf/  ) and I have difficulties
with bit manipulations, especially to transform a negative integer into a
series of bytes and back.

I can not find an implementation of a non-arithmetic shift for fixnums, and
a way to specify which size of fixnum to construct.

I can't also find an easy way to get the byte representation of flonums.

Do you have any idea?

Best regards,

Nicolas.
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