(obj-kill! ob)
  ob: an obj
  returns #n

Permanently deactivates an object.

A killed object has no fields, properties, methods or states. It still belongs to a class, so is?, class-of and has-state? will continue to work as expected.

When an object is killed, all of its states will be disabled; then, the fini method will be invoked; then, each of the fini-mixin methods will be invoked, from right to left.

Killing an object which has previous been killed is a silent no-op.

When an error bubbles through initialization or finalization code, the object will be killed automatically. Under those circumstances, no finalizers will be executed.