diff --git a/src/SerializedObject.cpp b/src/SerializedObject.cpp
index c8d243952..a7ce22ba4 100644
--- a/src/SerializedObject.cpp
+++ b/src/SerializedObject.cpp
@@ -396,6 +396,19 @@ bool STObject::isFieldPresent(SField::ref field) const
 	return peekAtIndex(index).getSType() != STI_NOTPRESENT;
 }
 
+STObject& STObject::peekFieldObject(SField::ref field)
+{
+	SerializedType* rf = getPField(field, true);
+	if (!rf)
+		throw std::runtime_error("Field not found");
+	if (rf->getSType() == STI_NOTPRESENT)
+		rf = makeFieldPresent(field);
+	STObject* cf = dynamic_cast<STObject*>(rf);
+	if (!cf)
+		throw std::runtime_error("Wrong field type");
+	return *cf;
+}
+
 bool STObject::setFlag(uint32 f)
 {
 	STUInt32* t = dynamic_cast<STUInt32*>(getPField(sfFlags, true));
diff --git a/src/SerializedObject.h b/src/SerializedObject.h
index f2c389f09..69683ed49 100644
--- a/src/SerializedObject.h
+++ b/src/SerializedObject.h
@@ -132,6 +132,8 @@ public:
 	void setFieldPathSet(SField::ref field, const STPathSet&);
 	void setFieldV256(SField::ref field, const STVector256& v);
 
+	STObject& peekFieldObject(SField::ref field);
+
 	bool isFieldPresent(SField::ref field) const;
 	SerializedType* makeFieldPresent(SField::ref field);
 	void makeFieldAbsent(SField::ref field);
@@ -199,6 +201,7 @@ public:
 	void pop_back()									{ value.pop_back(); }
 	bool empty() const								{ return value.empty(); }
 	void clear()									{ value.clear(); }
+	void swap(STArray& a)							{ value.swap(a.value); }
 
 	virtual std::string getFullText() const;
 	virtual std::string getText() const;