>And here I disagree, quite strongly. If I'm using "undocumented and warning-spitting methods" then I know what I have done is a hack and those methods could disappear or change at any time and I should proceed at my own peril.

We're in complete agreement, actually. I'm just saying that I generally don't expect things like that to change on a point release, not that it can't, won't, or shouldn't. You're definitely juggling chainsaws if you're in a situation like that.

In this case it was documented.