PEP 667: Remove open issues section, as the issues have been resolved (#3731)

peps/pep-0667.rst

@@ -425,33 +425,6 @@ whereas this PEP does not.
 :pep:`558` does not specify exactly when the internal copy is
 updated, making the behavior of :pep:`558` impossible to reason about.
 
-Open Issues
-===========
-
-Have locals() return a mapping proxy
-------------------------------------
-
-An alternative way to define ``locals()`` would be simply as::
-
-    def locals():
-        return sys._getframe(1).f_locals
-
-This would be simpler and easier to understand. However,
-there would be backwards compatibility issues when ``locals()`` is assigned
-to a local variable or passed to ``eval`` or ``exec``.
-
-Lifetime of the mapping proxy
------------------------------
-
-Each read of the ``f_locals`` attributes creates a new mapping proxy.
-This is done to avoid creating a reference cycle.
-
-An alternative would be to cache the proxy on the frame, so that
-``frame.f_locals is frame.f_locals`` would be true.
-The downside of this is that the reference cycle would delay collection
-of both the frame and mapping proxy until the next cycle collection.
-
-``PyEval_GetLocals()`` already creates a cycle, as it returns a borrowed reference.
 
 Implementation
 ==============