Context is missing copy()

[jondreads@…]

twisted.python.failure.Failure makes a copy of f_locals when an exception occurs using its copy method. The lack of a copy() method on Context prevents the twisted.web.server from generating tracebacks when an exception occurs in a <?python section.

I'm not sure why Twisted feels the need to copy f_locals but as it is supposed to be a dict-like object it should probably support copy()