isPlainObject slight error

[ben@…]

The return value for this is: for(key in obj) { }

return key === undefined

hasOwn.call( obj, key );

Unless I'm mistaken, shouldn't key === undefined actually be key !== undefined? If key is undefined that would mean the for..in loop found no properties.

[jitter]

Thanks for taking the time to contribute to the jQuery project by writing a bug report.

There is no bug here. The conditional is correct (an object with no properties is still an object).

If you would switch === to !== then isPlainObject would yield wrong results. E.g.

jQuery.isPlainObject( {} ); //would yield false instead of true
jQuery.isPlainObject( document); //would yield true instead of false