Great, this is smth I was thinking about recently as well. I do find nomatch=TRUE/FALSE confusing and keep.nomatch is better in that respect, but that's a lot more characters to type, which downgrades it for me a lot.
I think in a world where I was designing it from scratch I would have nomatch=NA do what it does now, nomatch=NULL do what 0 does now, and then the rest of the values would fill. Not sure if this can be done smoothly though in the world we live in.
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