The outer (aka text) interpreter converts numbers containing a dot into a double precision number. Note that only numbers with the dot as last character are standard-conforming.
d+
d1 d2 -- d double "d-plus"
d-
d1 d2 -- d double "d-minus"
dnegate
d1 -- d2 double "dnegate"
dabs
d1 -- d2 double "dabs"
dmin
d1 d2 -- d double "dmin"
dmax
d1 d2 -- d double "dmax"