DSSSL does not and therefore Chicken doesn't either.  S7 doesn't, Gauche doesn't, Gambit doesn't.  Guile does.  I think that's enough for us to reject it.

On Tue, Oct 29, 2019 at 2:29 PM Lassi Kortela <xxxxxx@lassi.io> wrote:
One more unresolved problem is whether 177 should support
"allow-other-keys". It would be useful in making wrapper procedures that
can pass unknown keywords on to another procedure.

I didn't check whether all the current Scheme implementations with
native keywords support allow-other-keys. I suspect some of them don't;
in that case the feature has to be left out of 177.