docs: function glyphStrip(ttf, glyphs) {
      // reference git: be5invis/node-sfnt/lib/ttf/ttf.js
      function getStringGlyfs(ttf, str) {
          let glyphs = [];
          let indexList = ttf.findGlyf({ unicode: str.split('').map(toCharCode) })
          if (indexList.length) glyphs = ttf.getGlyf(indexList);
          glyphs.unshift(ttf.get().glyf[0]);
          return glyphs;
      }
      let ttfObj = new TTF.TTF(ttf)
      ttfObj.setGlyf(getStringGlyfs(ttfObj, glyphs))
      return ttfObj.get()
  }