diff --git a/blackboard/bb_param/bb_param.cpp b/blackboard/bb_param/bb_param.cpp
index 3e65ee3..2ed1929 100644
--- a/blackboard/bb_param/bb_param.cpp
+++ b/blackboard/bb_param/bb_param.cpp
@@ -29,10 +29,6 @@ void BBParam::set_value_source(ValueSource p_value) {
 }
 
 Variant BBParam::get_saved_value() {
-	if (saved_value.get_type() != get_type()) {
-		Callable::CallError err;
-		Variant::construct(get_type(), saved_value, nullptr, 0, err);
-	}
 	return saved_value;
 }
 
@@ -50,7 +46,21 @@ void BBParam::set_variable(const String &p_value) {
 
 String BBParam::to_string() {
 	if (value_source == SAVED_VALUE) {
-		return String(saved_value);
+		String s = saved_value.stringify();
+		switch (get_type()) {
+			case Variant::STRING: {
+				s = s.c_escape().quote();
+			} break;
+			case Variant::STRING_NAME: {
+				s = "&" + s.c_escape().quote();
+			} break;
+			case Variant::NODE_PATH: {
+				s = "^" + s.c_escape().quote();
+			} break;
+			default: {
+			} break;
+		}
+		return s;
 	} else {
 		return LimboUtility::get_singleton()->decorate_var(variable);
 	}
@@ -95,5 +105,6 @@ void BBParam::_bind_methods() {
 BBParam::BBParam() {
 	value_source = SAVED_VALUE;
 	variable = "";
-	saved_value = Variant();
+
+	_assign_default_value();
 }
diff --git a/blackboard/bb_param/bb_param.h b/blackboard/bb_param/bb_param.h
index 343eb20..4a74e2d 100644
--- a/blackboard/bb_param/bb_param.h
+++ b/blackboard/bb_param/bb_param.h
@@ -43,6 +43,11 @@ protected:
 
 	virtual Variant::Type get_type() const { return Variant::NIL; }
 
+	_FORCE_INLINE_ void _assign_default_value() {
+		Callable::CallError err;
+		Variant::construct(get_type(), saved_value, nullptr, 0, err);
+	}
+
 	void _get_property_list(List<PropertyInfo> *p_list) const;
 
 public:
diff --git a/blackboard/bb_param/bb_variant.cpp b/blackboard/bb_param/bb_variant.cpp
index d27e727..2e92dc6 100644
--- a/blackboard/bb_param/bb_variant.cpp
+++ b/blackboard/bb_param/bb_variant.cpp
@@ -14,9 +14,18 @@
 #include "core/variant/variant.h"
 
 void BBVariant::set_type(Variant::Type p_type) {
-	type = p_type;
-	notify_property_list_changed();
-	emit_changed();
+	if (type != p_type) {
+		type = p_type;
+		if (get_saved_value().get_type() != p_type) {
+			_assign_default_value();
+		}
+		emit_changed();
+		notify_property_list_changed();
+	}
+}
+
+Variant::Type BBVariant::get_type() const {
+	return type;
 }
 
 void BBVariant::_bind_methods() {
@@ -33,5 +42,4 @@ void BBVariant::_bind_methods() {
 }
 
 BBVariant::BBVariant() {
-	type = Variant::NIL;
 }
diff --git a/blackboard/bb_param/bb_variant.h b/blackboard/bb_param/bb_variant.h
index f806233..d8664bd 100644
--- a/blackboard/bb_param/bb_variant.h
+++ b/blackboard/bb_param/bb_variant.h
@@ -20,12 +20,12 @@ class BBVariant : public BBParam {
 	GDCLASS(BBVariant, BBParam);
 
 private:
-	Variant::Type type;
+	Variant::Type type = Variant::NIL;
 
 protected:
 	static void _bind_methods();
 
-	virtual Variant::Type get_type() const override { return type; }
+	virtual Variant::Type get_type() const override;
 	void set_type(Variant::Type p_type);
 
 public: