summing NumPy byte arrays

[David R. Smith]

I have a big NumPy byte array, and want to sum it.  Unfortunately, the
add.reduce (alias: sum) method does the sum in the same size receptacle,
e.g., 

>>> from Numeric import *
>>> X = arange(255, typecode='b')
>>> sum(X)
129
>>> 

How can I get it to sum the array in a full-width accumulator, without
making an up-sized copy of the array?

	David Smith

ps. The array I am working with is a 2-d noncontinguous slice.