Is a question of the form "Is feature X supported / going to be supported in language Y? (and why not)" appropriate in StackOverflow?
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I think it depends on the nature of feature X and language Y. I mean, if it's a really simple, answerable question like:
You can fall back to the numerous "simple" question threads for your answer of whether SO should be the authoritative source on that.
If it's a question that's more complicated or language-specific, like:
I think that clearly falls under StackOverflow to answer (as long as its not a duplicate, in which case we can flag it as so!)
If it's more of a theory/conceptual question, like:
It probably belongs on Programmer's
Any of those that end in the and why or and why not, should also probably go to Programmer's as it's more of a discussion at that point, about the theory of why it was or wasn't included in the language, and no verifiable/working answer can be given.