failed experiment to monkey-patch ArrayBuffer.prototype

ab.js

"use strict";

{
  let abp = ArrayBuffer.prototype;
  const VIEW = Symbol('view');

  function getView(receiver) {
    return receiver[VIEW] ||
           (receiver[VIEW] = new Uint8Array(receiver));
  }

  function asIndex(s) {
    if (typeof s !== 'string') {
      return -1;
    }

    let n = parseInt(s);

    return (!isNaN(n) && String(n) === s
          ? n
          : -1);
  }

  function getIndex(target, i, receiver) {
    return getView(receiver)[i];
  }

  function setIndex(target, i, value, receiver) {
    getView(receiver)[i] = value;
    return true;
  }

  let handler = {
    get(target, prop, receiver) {
      let i = asIndex(s);
      return (i > -1) ? getIndex(target, i, receiver) : Reflect.get(abp, prop, receiver);
    },
             
    set(target, prop, value, receiver) {
      let i = asIndex(s);
      return (i > -1) ? setIndex(target, i, value, receiver) : Reflect.set(abp, prop, value, receiver);
    },
    
    has(target, prop) {
      let i = asIndex(s);
      return (i > -1) || Reflect.has(abp, prop); 
    }
  };
   
  ArrayBuffer.prototype = new Proxy(abp, handler);
}