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  1. // 19.1.2.9 / 15.2.3.2 Object.getPrototypeOf(O)
  2. var has = require('./_has');
  3. var toObject = require('./_to-object');
  4. var IE_PROTO = require('./_shared-key')('IE_PROTO');
  5. var ObjectProto = Object.prototype;
  6. module.exports = Object.getPrototypeOf || function (O) {
  7. O = toObject(O);
  8. if (has(O, IE_PROTO)) return O[IE_PROTO];
  9. if (typeof O.constructor == 'function' && O instanceof O.constructor) {
  10. return O.constructor.prototype;
  11. } return O instanceof Object ? ObjectProto : null;
  12. };