- to prevent further occurences of ValueType == 0 being misinterpreted, change it to signify unknown value type and ensure that any real type is non-zero.

src/thingdef/thingdef_exp.h

@@ -195,6 +195,7 @@ protected:
 	{
 		isresolved = false;
 		ScriptPosition = pos;
+		ValueType = VAL_Unresolved;
 	}
 public:
 	virtual ~FxExpression() {}

src/thingdef/thingdef_type.h

@@ -8,6 +8,7 @@
 
 enum ExpValType
 {
+	VAL_Unresolved,	// type not yet known
 	VAL_Int,		// integer number
 	VAL_Float,		// floating point number
 	VAL_Unknown,	// nothing