More clarifying comments.

src/greentest/monkey_package/issue302monkey.py

@@ -9,12 +9,19 @@ else:
 print(__file__)
 
 if sys.version_info[:2] == (2, 7):
+    # Prior to gevent 1.3, 'python -m gevent.monkey' guaranteed this to be
+    # None for all python versions.
     print(__package__ == None)
 else:
     if sys.argv[1] == 'patched':
-        # __package__ is handled differently, for some reason,
-        # and runpy doesn't let us override it. When we call it,
-        # it becomes ''
+        # __package__ is handled differently, for some reason, and
+        # runpy doesn't let us override it. When we call it, it
+        # becomes ''. This appears to be against the documentation for
+        # runpy, which says specifically "If the supplied path
+        # directly references a script file (whether as source or as
+        # precompiled byte code), then __file__ will be set to the
+        # supplied path, and __spec__, __cached__, __loader__ and
+        # __package__ will all be set to None."
         print(__package__ == '')
     else:
         # but the interpreter sets it to None