Changes to Typeable

Simon Peyton-Jones simonpj at
Mon Feb 13 10:35:03 CET 2012

Friends (Ian pointed out that I should have sent this to the libraries list):

The page describes an improved implementation of the Typeable class, making use of polymorphic kinds. Technically it is straightforward, but it represents a non-backward-compatible change to a widely used library, so we need to make a plan for the transition.
Comments?  You can fix typos or add issues directly in the wiki page, or discuss by email


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