Takes the topmost item and evaluates it as a PumpkinScript program on the current stack
Output stack: result of
PumpkinDB> 10 [DUP] EVAL 10 10
Allocates a copy of the code (this might change in the future) during the runtime.
EmptyStack error if there is less than one item on the stack
Decoding error error if the code is undecodable.
works : 10 [DUP] EVAL 2 WRAP 10 10 2 WRAP EQUAL?. empty_stack : [EVAL] TRY UNWRAP 0x04 EQUAL?. invalid_code : [1 EVAL] TRY UNWRAP 0x05 EQUAL?.