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numpy.ma.harden_mask
ma.harden_mask(self) = <numpy.ma.core._frommethod object>- 
    
Force the mask to hard.
Whether the mask of a masked array is hard or soft is determined by its
hardmaskproperty.harden_masksetshardmasktoTrue.See also
 
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 https://numpy.org/doc/1.20/reference/generated/numpy.ma.harden_mask.html