vm/ops.go
func txRange(st *State) {
	lhs := interfaceToNumeric(st.sb).Int()
	rhs := interfaceToNumeric(st.sa).Int()

	for i := lhs; i <= rhs; i++ {
		// push these to stack
		st.StackPush(i)
	}

	st.Advance()
}
func txRange(st *State) {
	lhs := interfaceToNumeric(st.sb).Int()
	rhs := interfaceToNumeric(st.sa).Int()

	for i := lhs; i <= rhs; i++ {
		// push these to stack
		st.StackPush(i)
	}

	st.Advance()
}
// XXX can I just push a []int to st.sa?