code: def _agl_compliant_name(glyph_name):
      
      MAX_GLYPH_NAME_LENGTH = 63
      clean_name = re.sub("[^0-9a-zA-Z_.]", "", glyph_name)
      if len(clean_name) > MAX_GLYPH_NAME_LENGTH:
          return None
      return clean_name
docs: Return an AGL-compliant name string or None if we can't make one.