_scale_internal(self, type=None, option='old', bscale=None, bzero=None, blank=0)
TODO: This is only needed for fixing #3865 without introducing any public API changes. We should support BLANK better when rescaling data, and when that is added the need for this internal interface should go away.
Note: the default of blank=0
merely reflects the current behavior, and is not necessarily a deliberate choice (better would be to disallow conversion of floats to ints without specifying a BLANK if there are NaN/inf values).
This is an internal implementation of the scale
method, which also supports handling BLANK properly.
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