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'use strict';
var $ = require('./$')
, isObject = require('./$.is-object')
, HAS_INSTANCE = require('./$.wks')('hasInstance')
, FunctionProto = Function.prototype;
// 19.2.3.6 Function.prototype[@@hasInstance](V)
if(!(HAS_INSTANCE in FunctionProto))$.setDesc(FunctionProto, HAS_INSTANCE, {value: function(O){
if(typeof this != 'function' || !isObject(O))return false;
if(!isObject(this.prototype))return O instanceof this;
// for environment w/o native `@@hasInstance` logic enough `instanceof`, but add this:
while(O = $.getProto(O))if(this.prototype === O)return true;
return false;
}});
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