it makes no difference whether I spell it amn't, an't, or aren't, as it's pronounced the same.

Nicholas, she said, looking at him out of the corners of her eyes, are you by chance trying to put one over?
How on earth can amn't and aren't be pronounced the same?
I have never thought of using amn't, because it is so hard to say--exactly as it looks:ammmm-nnnt. An't is ant, and that's all there is to that. Aren't is arrrrrrnt. Geez!
(Though I will concede that Brit-speakers probably say aren't as aahhhhhnt. But amnt = ahnt? No way!)