Function z

resources/vega-lite.min.js:130–132

(e)

    F = Object.values,
    O = Object.entries;
  function z(e) {
    return !0 === e || !1 === e;
  }
  function C(e) {
    const t = e.replace(/\W/g, "_");
    return (e.match(/^\d+/) ? "_" : "") + t;