text: SPARSE_TTF_MASTER_TABLES = frozenset(
      ["glyf", "head", "hmtx", "loca", "maxp", "post", "vmtx"]
  )
  SPARSE_OTF_MASTER_TABLES = frozenset(["CFF ", "VORG", "head", "hmtx", "maxp", "vmtx"])
  
  UFO2FT_PREFIX = "com.github.googlei18n.ufo2ft."
  GLYPHS_PREFIX = "com.schriftgestaltung."
  
  FILTERS_KEY = UFO2FT_PREFIX + "filters"
  
  MTI_FEATURES_PREFIX = UFO2FT_PREFIX + "mtiFeatures"
  
  FEATURE_WRITERS_KEY = UFO2FT_PREFIX + "featureWriters"
  
  USE_PRODUCTION_NAMES = UFO2FT_PREFIX + "useProductionNames"
  GLYPHS_DONT_USE_PRODUCTION_NAMES = GLYPHS_PREFIX + "Don't use Production Names"
  KEEP_GLYPH_NAMES = UFO2FT_PREFIX + "keepGlyphNames"
  
  COLOR_LAYERS_KEY = UFO2FT_PREFIX + "colorLayers"
  COLOR_PALETTES_KEY = UFO2FT_PREFIX + "colorPalettes"
  COLOR_LAYER_MAPPING_KEY = UFO2FT_PREFIX + "colorLayerMapping"
  