Fix VM memory allocation optimizations by reducing what we allocate on the heap

internal/object/error.go

@@ -6,22 +6,22 @@ type Error struct {
 	Message string
 }
 
-func (e *Error) Bool() bool {
+func (e Error) Bool() bool {
 	return false
 }
 
-func (e *Error) Type() Type {
+func (e Error) Type() Type {
 	return ErrorType
 }
 
-func (e *Error) Inspect() string {
+func (e Error) Inspect() string {
 	return "Error: " + e.Message
 }
 
-func (e *Error) Clone() Object {
-	return &Error{Message: e.Message}
+func (e Error) Clone() Object {
+	return Error{Message: e.Message}
 }
 
-func (e *Error) String() string {
+func (e Error) String() string {
 	return e.Message
 }