EDIT: you guys have dug up some truly horrible pisstakes :D Thank you for those.
To the serious folk - relax a little. This is Mildly Infuriating, not I'm dying if this doesn't stop. As a non-native speaker I was taught a certain way to use the language. The rules were not written down by me, nor the teachers - it was done by the native folk. Peace!
How would Appalachian English say “Don’t not go there”? Even languages that only use negative concord have constructions to do double negatives, in Russian that’s done like “This is not unprovable” vs. “This is provable”, with “un-” (“без- / бес-”) being a very productive modifier. Sometimes the double negation becomes so common that it becomes part of the word, say небезопасный, “nonundangerous”.
I would expect, in practice, something like “Don’t stay away from there” but as we’re talking about a dialect continuum it doesn’t sound terribly unlikely for people to simply switch grammar (not necessarily phonetics or lexicon) to a dialect in which there’s no negative concord. And that, mostly, is what I mean by “ambiguous”.