docs: def mdaZeros(shap, dtype=numpy.float, mask=None):
      """
      Zero constructor for masked distributed array
      @param shap the shape of the array
      @param dtype the numpy data type
      @param mask mask array (or None if all data elements are valid)
      """
      res = MaskedDistArray(shap, dtype)
      res[:] = 0
      res.mask = mask
      return res