Conflict with prototype.js

[svkarpovich]

Hi,

There is a problem with interchange plugin.
Prototype.js has added methods to array. And var "rules" has many keys, that we shouldn't use.
One screenshot you can see that i == 'each' - ERROR

Please check that property is own.
if (!rules.hasOwnProperty(i)) continue;

[colin-marshall]

Closed in #8686. Thanks @svkarpovich!