concat handles NodeList specially (FF)

[bill]

Not sure if this is considered a bug or not. (Feel free to close.) concat() normally combines two arrays:

>>> [1, 2, 3].concat([4, 5, 6])
[1, 2, 3, 4, 5, 6]

but for NodeList?:

[1, 2, 3].concat(dojo.query("table"))

It doesn't realize that the NodeList? is an Array and so it generates extra nesting:

[1, 2, 3, [table#source, table#continents]]

[alex]

The example here is the built-in Array class concat()-ing a NodeList? which is out of scope for our implementation to handle. To do so would require replacing the built-in concat() on the Array prototype (and therefore making it enumerable, I think, which is something we'll never do).

Marking wontfix.