NULL placeholder in $List functions?
Today in docs I found this example using NULL:
WRITE $LISTVALID($LB(NULL)),!
simplified
zzdump $LB(NULL)
and NULL can be case-insensitive:
zzdump $LB(null)
seems the same as just:
zzdump $LB()
But if null variable is defined then list would contain value from variable. Case sensitive in that situation.
Does anyone have any Idea what is this? Is NULL used anywhere besides as a list element?