[aidenn0]

If that's enough to make a language pure OOP, then Common Lisp is also a pure OOP languge:

  CL-USER> (class-of 42)
  #<BUILT-IN-CLASS COMMON-LISP:FIXNUM>

[kazinator]

If you're class of `42, you're probably a Lisp graybeard.

[pjmlp]

Common Lisp Object System and The Art of Metaobject Protocol.

Yes.