Change primitive used to check for monitor owner during initialize..

Author: aardvark179

lib/mri/monitor.rb

@@ -227,7 +227,7 @@ def initialize(*args)
   # Initializes the MonitorMixin after being included in a class or when an
   # object has been extended with the MonitorMixin
   def mon_initialize
-    if defined?(@mon_mutex) && Primitive.object_same_or_equal(@mon_mutex_owner_object, self)
+    if defined?(@mon_mutex) && Primitive.object_equal(@mon_mutex_owner_object, self)
       raise ThreadError, 'already initialized'
     end
     @mon_mutex = Thread::Mutex.new