Index: compiled/String.h
===================================================================
--- a/compiled/String.h
+++ b/compiled/String.h
@@ -276,17 +276,17 @@
     OwnedString newValue(length() + additionalSize);
     if (length() > 0)
       std::memcpy(newValue.mBuf, mBuf, sizeof(value_type) * length());
     *this = std::move(newValue);
   }
 
 public:
   explicit OwnedString(size_type len = 0)
-      : String(nullptr, len, READ_WRITE)
+      : String(nullptr, len, len ? READ_WRITE : INVALID)
   {
     if (len)
     {
       mBuf = new value_type[length()];
       annotate_address(mBuf, "String");
     }
     else
       mBuf = nullptr;
@@ -319,16 +319,21 @@
   }
 
   ~OwnedString()
   {
     if (mBuf)
       delete[] mBuf;
   }
 
+  void reset(const String& str)
+  {
+    *this = str;
+  }
+
   OwnedString& operator=(const String& str)
   {
     *this = OwnedString(str);
     return *this;
   }
 
   OwnedString& operator=(const OwnedString& str)
   {