found a minor issue encoding \177 a.k.a. \u007F, that was encoded in lowercase

server/json_spirit/json_spirit_writer_template.h

@@ -63,7 +63,7 @@ namespace json_spirit
             case '\n': s += to_str< String_type >( "\\n"  ); return true;
             case '\r': s += to_str< String_type >( "\\r"  ); return true;
             case '\t': s += to_str< String_type >( "\\t"  ); return true;
-            case '\177': s += to_str< String_type >( "\\u007f"  ); return true;
+            case '\177': s += to_str< String_type >( "\\u007F"  ); return true;
         }
 
         // _always_ convert all remaining ASCII control characters into \uXXXX form:

server/unittest_json.cc

@@ -24,7 +24,7 @@ const std::vector<TestTriple> testValues =
 	{
 		{ ""      , R"("")"                   , R"("")"        },  // always start with the simple case ;-)
 		{ "123"   , R"("123")"                , R"("123")"     },  // some ASCII digits. Still easy.
-		{ "\n\\\b", R"("\n\\b")"              , R"("\n\\b")"   },  // backslash escapes for ASCII and control chars
+		{ "\n\\\b", R"("\n\\\b")"             , R"("\n\\\b")"  },  // backslash escapes for ASCII and control chars
 		{ "\x1f"  , R"("\u001F")"             , R"("\u001F")"  },  // C compiler knows \x##, but JSON does not
 		{ "\x7f"  , R"("\u007F")"             , R"("\u007F")"  },  // C compiler knows \x##, but JSON does not
 		{ "äöü"   , R"("\u00E4\u00F6\u00FC")" , R"("äöü")"     },