Re: [PATCH 3/3] Add `fixnum?' VM primitive

[Andy Wingo]

Hi Andreas,

I applied the first two, thanks.

I am hesitant about this one for three reasons:

 1) I don't want the compiler to import (rnrs arithmetic fixnums).
    Rather, if we were to do this, I would have that module register its
    primitives, as GOOPS does.

 2) Something about this sounds wrong to me.  If fixnum? is important,
    why not have it in Guile's default environment directly?  Or some
    other non-R6RS namespace.  What about, for example,
    `exact-integer?'?  And why for fixnums and not flonums?

 3) Are there no alternatives, like exposing Guile's tags to Scheme
    directly?  (ice-9 tags) for example.  Then we could inline tc3?,
    tc8?, and tc16? ops.  Some other predicates would become
    unnecessary; char? for example.  Perhaps this is a bad idea though.

Apologies for being crabby here after you've done all this work :)  It
could well be that something close to this is the right thing.

Cheers,

Andy
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