Get any width (if one is present) in CFF parser   - in charstring specs at page 21 (section 4.2): "Also, it may appear in the charstring as the difference from nominalWidthX" so the number we've on the stack doesn't have to be positive.   - currently this bug has probably no visible effect   - but when the font is loaded to be used with XFA, then the rendering is incorrect.
Get any width (if one is present) in CFF parser
  - in charstring specs at page 21 (section 4.2): "Also, it may appear in the charstring as the difference from nominalWidthX" so the number we've on the stack doesn't have to be positive.
  - currently this bug has probably no visible effect
  - but when the font is loaded to be used with XFA, then the rendering is incorrect.

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