Adjusting jQ 2.0 $.extend to align with ES6 Object.assign

[jdalton]

I wanted to bring up the topic of adjusting $.extend to align with ES6 Object.assign (basically restricting to iterating over own properties of source objects).

[dmethvin]

Well the 1.9 and 2.0 APIs need to behave the same way, so if we did it in 2.0 we'd need to add it to 1.9.1 as well. This seems like it becomes a request to make all of jQuery 1.9.1+/2.0+ hasOwnProperty-guarded, so no bare for/in *anywhere* in the lib, fixing $.extend(), etc.

Clearly we can't depend on ES6 features being present yet, even in 2.0. Exactly when does this issue arise for a user of $.extend()?

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