Old research question: What is a correct emulator?

New research question after thinking about the old research question for a while: Oh god. Oh no. What is an emulator?

@lindsey 'What, if anything, is an emulator?'
@joshua This, but with "transpiler", is also what you commented on my blog post complaining about the word "transpiler" nine years ago
@lindsey The worst part of that is that I did not even get that snowclone from the original "what, if anything, is a parrot", but instead, I got it from @tom7 's classic, https://tom7.org/papers/epsilon.pdf , which must have been relatively fresh in my mind at the time
@joshua @tom7 @lindsey this meme has its roots in animal taxonomy! see "what, if anything, is a rabbit" (wood 1957) https://www.jstor.org/stable/2406062?seq=1
@joshua @tom7 @lindsey ...wait hang on you did say this but i'm pretty sure it's rabbit and not parrot (i can't find one about parrots)
@chrisamaphone @tom7 @lindsey Yeah, I apparently had an uncorrected double-bit error