use a newtype for Key
should be more efficient
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@ -14,7 +14,7 @@ import Test.QuickCheck
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type KeyName = String
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type BackendName = String
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data Key = Key (BackendName, KeyName) deriving (Eq, Ord)
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newtype Key = Key (BackendName, KeyName) deriving (Eq, Ord)
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data Backend a = Backend {
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-- name of this backend
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