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The double negative is a bunch of hogwash. SOME MAN wrote a grammar book and decided he didn't like the sound of the double negative. It then became a way for those that could read to differentiate themselves from those that could not read (think social class prejudice) Many languages use the double negative to emphasize the negative.
I will go back and look at the links you posted, but it makes sense to me that a double negative isn't proper. After all, adding the second negative changes the meaning of the sentence. If you don't got no eggs, you obviously have some eggs. If you don't have any eggs, I know I can't buy them from you today.