Takes the entire stack and pushes it back as a byte array
STACK takes the entire stack and pushes it as a binary
form PumpkinScript onto the stack. If passed to UNWRAP,
the same stack will be restored.
PumpkinDB> 1 2 3 STACK 0x111213 PumpkinDB> 1 2 3 STACK UNWRAP 0x1 0x2 0x3
Allocates for the new values
works : 1 2 3 STACK [1 2 3] EQUAL?. work_nil : STACK  EQUAL?.