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IMO, such a rewrite would expose too many of pprint's
internals and make the module harder to
use/understand/maintain. Wouldn't it be better to stick
with the usual idiom for controlling the repr() formatting
of specific types by using a class wrapper:
>>> from pprint import pprint
>>> class Int(int):
	def __repr__(self):
		return hex(self)
>>> pprint([Int(x) for x in range(0x10000000,0x10000010)])
[0x10000000,
 0x10000001,
 0x10000002,
 0x10000003,
 0x10000004,
 0x10000005,
 0x10000006,
 0x10000007,
 0x10000008,
 0x10000009,
 0x1000000a,
 0x1000000b,
 0x1000000c,
 0x1000000d,
 0x1000000e,
 0x1000000f]