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"a" vs "an" is solely a matter of pronunciation; you go off of the next word no matter what it is.

That's what I had assumed, but this grammar StackExchange[1] answer seemed to specify that there are exceptions. Admittedly, I didn't read the articles he linked.

1: https://english.stackexchange.com/a/115200

> I need an (well, if I need anything at all) idiom.

This is not an English sentence. No native English speaker would produce this (regardless of a/an)

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