One class record [nameIdx, system, propBits, supers, slots] (supers: dictionary indices of the direct
superclasses, in declaration order), with an optional trailing pkgIdx naming the package that defines the
class when that is not the one carrying the record (see ClassProp.Foreign); additive, so older readers stay working.
One class record
[nameIdx, system, propBits, supers, slots](supers: dictionary indices of the direct superclasses, in declaration order), with an optional trailingpkgIdxnaming the package that defines the class when that is not the one carrying the record (see ClassProp.Foreign); additive, so older readers stay working.