Once the spec is added, a smart link to it should be added from:
Along the same lines, I couldn't find a spec for either "not" or "true",
which both have passing tests for pugs in t/builtins/bool/
TimToady caught me on IRC and pointed out where "Inf", "not" and "true"
are mentioned in the spec, if only briefly. Smart links have been added
for them now.