malloc_conf J j

Does 'J' simply make the junk level two and
does 'j' simply make the junk level zero?

The current "increase/decrease" wording in malloc(3)
can suggest it has a memory. For example, setting

vm.malloc_conf=J

"increases" junk level to two;
does setting

vm.malloc_conf=C

later retain a junk level of two,
as there is no 'j' to "decrease" it,
or is the junk level the defult of one now?

Jan