Does MLab.std() dislike Numeric.UnsignedInt8?

[Kyler Laird]

	Python 2.3.3 (#2, Jan  4 2004, 12:24:16)
	[GCC 3.3.3 20031229 (prerelease) (Debian)] on linux2
	Type "help", "copyright", "credits" or "license" for more information.
	>>> import Numeric
	>>> import MLab
	>>> import Scientific.Statistics
	>>> MLab.std(Numeric.array([255,255], Numeric.Int0))
	0.0
	>>> MLab.std(Numeric.array([255,255], Numeric.UnsignedInt8))
	181.01933598375618
	>>> Scientific.Statistics.standardDeviation(Numeric.array([255,255], Numeric.UnsignedInt8))
	0.0

It seems to me that the return values should all be the same.  Am I missing
something simple?

--kyler