Tests if the topmost stack item's length is larger than zero.
SOME? will push
1 if the item's length is larger than zero,
It has a "sister" instruction of NONE?. Together they allow to express a concept of an optional value.
PumpkinDB>  SOME? 0 PumpkinDB>  SOME? 1
EmptyStack error if there is less than one items on the stack
works :  SOME?. works_1 :  SOME? NOT. empty_stack : [SOME?] TRY UNWRAP 0x04 EQUAL?.