fix type-to-string conv. + fix binary type check + add modulo + rework import (now include)

core/vm.go

@@ -41,6 +41,8 @@ const (
 	InstructionMulInt
 	// InstructionDivInt pop two ints and divide the second by the first
 	InstructionDivInt
+	// InstructionModInt pop two ints and compute the modulo of the first by the second
+	InstructionModInt
 	// InstructionNegateInt negate the int; if it was positive, make it negative, and vice versa.
 	InstructionNegateInt
 
@@ -810,6 +812,12 @@ func (vm *VM) Next() bool {
 
 		vm.Stack.Push(&IntegerValue{new(big.Int).Div(l, r)})
 
+	case InstructionModInt:
+		r := vm.Stack.Pop().(*IntegerValue).Number
+		l := vm.Stack.Pop().(*IntegerValue).Number
+
+		vm.Stack.Push(&IntegerValue{new(big.Int).Mod(l, r)})
+
 	case InstructionNegateInt:
 		v := vm.Stack.Pop().(*IntegerValue).Number