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binascii makes sense because that's where the hexlify and 
unhexlify functions live, which are small conceptual steps 
away from what's needed here.

Methods on numbers make sense too, and only seem strange 
because so few are clearly visible now (although, e.g., there 
are lots of them already, like number.__abs__ and 
number.__add__).

The struct module makes sense too, although it would be 
darned ugly to document a refusal to accept the new codes 
in "native" mode; and struct has a high learning curve; and 
struct obviously never intended to support types that aren't 
supplied directly by C compilers (the "Pascal string" code 
seems weird now, but not at the time).