I don't know much about pimpl (other than that it is an idiom), so would this make sense or are they actually different things?
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Being a new-tag-deletionist, I've removed the tag from the only question that had it. Normally I avoid nuking new tags created by users with rep considerably higher than myself, but as this already had a meta discussion, I figured "hey, why not."
"Pimpl idiom" is the canonical form, and will be the first thing in the autocomplete as people enter the tag.
I've also contributed a stub tag wiki for pimpl-idiom.