On Feb 29, 2012, at 3:52 PM, Victor Stinner wrote: > I don't know if hardening Python is a compelling argument to add a new > builtin type.
It isn't. Builtins are for general purpose use. It is not something most people should use; however, if it is a builtin, people will be drawn to frozendicts like moths to a flame. The tuple-as-frozenlist anti-pattern shows what we're up against. Another thought: if pypy is successful at providing sandboxing, the need for sandboxing in CPython is substantially abated. Raymond
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