diff --git a/examples/sandbox.txt b/examples/sandbox.txt
index 2311fcc..db1bfb4 100644
--- a/examples/sandbox.txt
+++ b/examples/sandbox.txt
@@ -48,3 +48,10 @@
 (factorial 2)
 (factorial 3)
 (factorial 4)
+
+
+
+
+
+
+
diff --git a/gc/inc_external_refcount.c b/gc/inc_external_refcount.c
index 38e4a3c..0caf2a6 100644
--- a/gc/inc_external_refcount.c
+++ b/gc/inc_external_refcount.c
@@ -60,7 +60,7 @@ struct value* gc_inc_external_refcount(
             }
             #endif
             
-            assert(value->externally_referenced.in_set);
+            assert(value->externally_referenced.in_set == true);
         }
         else
         {
@@ -72,3 +72,14 @@ struct value* gc_inc_external_refcount(
     return value;
 }
 
+
+
+
+
+
+
+
+
+
+
+
diff --git a/value/string/compare.c b/value/string/compare.c
index e69de29..5954bb1 100644
--- a/value/string/compare.c
+++ b/value/string/compare.c
@@ -0,0 +1,11 @@
+
+#include <debug.h>
+
+#include "compare.h"
+
+int compare_string_values(
+    const struct value* a,
+    const struct value* b)
+{
+    TODO;
+}
diff --git a/value/string/compare.h b/value/string/compare.h
index e69de29..5644321 100644
--- a/value/string/compare.h
+++ b/value/string/compare.h
@@ -0,0 +1,7 @@
+
+int compare_string_values(
+    const struct value* a,
+    const struct value* b);
+
+
+