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diff --git a/overlays/spm/lib/Data/CaseInsensitive/Instances.hs b/overlays/spm/lib/Data/CaseInsensitive/Instances.hs
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+{-# OPTIONS_GHC -fno-warn-orphans #-}
+
+module Data.CaseInsensitive.Instances () where
+
+import Prelude
+
+import Data.CaseInsensitive (CI)
+import qualified Data.CaseInsensitive as CI
+
+import Servant.API.ContentTypes
+
+import Data.Aeson
+
+
+instance MimeRender PlainText a => MimeRender PlainText (CI a) where
+  mimeRender p = mimeRender p . CI.original
+
+instance ToJSON a => ToJSON (CI a) where
+  toJSON = toJSON . CI.original
+
+instance (FromJSON a, CI.FoldCase a) => FromJSON (CI a) where
+  parseJSON = fmap CI.mk . parseJSON