--- xnu/xnu-1504.7.4/libkern/c++/OSBoolean.cpp
+++ xnu/xnu-4570.71.2/libkern/c++/OSBoolean.cpp
@@ -110,5 +110,7 @@
 
 bool OSBoolean::serialize(OSSerialize *s) const
 {
+    if (s->binary) return s->binarySerialize(this);
+
     return s->addString(value ? "<true/>" : "<false/>");
 }