[Numpy-discussion] numpy.ma dtype.char set to "?"

Hi I'm tracked down a bug in our code back to the numpy.ma s2=numpy.array([[10,60],[65,45]]) s3=numpy.ma.masked_greater(s2,50.) s3.mask.dtype.char returns: '?' In the Numeric -> numpy.ma (page 35) the "?" is not listed. Is it an omission in numpy.ma ? Or is it a valid char type ? s3.dtype does say it is of type "bool" which I guess should be 'B' or 'b' no ? Thanks, C.