code: def normalizeGlyphBottomMargin(value):
      
      if not isinstance(value, (int, float)) and value is not None:
          raise TypeError("Glyph bottom margin must be an "
                          ":ref:`type-int-float`, not %s."
                          % type(value).__name__)
      return value
docs: Normalizes glyph bottom margin.
  
      * **value** must be a :ref:`type-int-float` or `None`.
      * Returned value is the same type as the input value.