@TomMalbran alright, you've convinced me :-)  I'll merge as-is.  To clarify, though -- we shouldn't actually use any of these methods on arrays.  We always use the modern browser methods built into the array itself.

@dangoor At some point we had been talking about pulling in Underscore, but I'm not sure why it hasn't actually happened yet.  I think Glenn & NJ were spearheading that, so they might know more.