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The cause: Relatively recent (last month) patches to getargs.c added overflow
checking to the PyArg_Parse*() integral formatters thereby restricting 'b' to
unsigned char value and 'h','i', and 'l' to signed integral values (i.e. if
the incoming value is outside of the specified bounds you get an
OverflowError, previous it silently overflowed).

The problem: This broke the array module (as Fredrik pointed out) because
*its* formatters relied on the loose allowance of signed and unsigned ranges
being able to pass through PyArg_Parse*()'s formatters.

The fix: This patch fixes the array module to work with the more strict
bounds checking now in PyArg_Parse*().

How: If the type signature of a formatter in the arraymodule exactly matches
one in PyArg_Parse*(), then use that directly. If there is no equivalent type
signature in PyArg_Parse*() (e.g. there is no unsigned int formatter in
PyArg_Parse*()), then use the next one up and do some extra bounds checking
in the array module.

Testing: test_array.py was also extended to check that one can set the full
range of values for each of the integral signed and unsigned array types.