What is the best way to write binary data such that I have control of the
representation?  Basically, I want the Racket equivalent of the Perl 'pack
<http://perldoc.perl.org/functions/pack.html>' and 'unpack
functions, where I can do:  pack('C', 202) and get back a one-byte binary
representation of the decimal number 202 (or pack('s', 202) to get a 2-byte
version) that I could then write to a port.

The reason that I'm looking for this is that I'm going to be writing binary
data across the network and I want to be able to control the
representation.  For a fairly trivial example, I want to be able to decide
how many bytes the number 202 should take up.[1]   Furthermore, I'd like to
have an easy way to do quick and dirty testing; I thought that writing to a
byte string would be that way, but I'm not having much success with it, as
I haven't figured out how to make things go in as raw bytes instead of

I've looked at fasl, binary-class, the implementation of protobuf, and
everything in the racket-lang docs that I could think of keywords for, with
no luck.  This feels like it should be a straightforward task, so I'm
frustrated with myself for not figuring it out more quickly.

[1] I keep using the number 202 because that's the size of one particular
message that I'm using in my text script and I'm trying to do RLE on it.

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