fix Data.Map.updateAt
See http://haskell.org/pipermail/libraries/2007-July/007785.html for a piece of code triggering the bug. updateAt threw away parts of the tree making up the map.
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See http://haskell.org/pipermail/libraries/2007-July/007785.html for a piece of code triggering the bug. updateAt threw away parts of the tree making up the map.