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diff --git a/overlays/spm/lib/Crypto/JWT/Instances.hs b/overlays/spm/lib/Crypto/JWT/Instances.hs
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+++ b/overlays/spm/lib/Crypto/JWT/Instances.hs
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+{-# OPTIONS_GHC -fno-warn-orphans #-}
+
+module Crypto.JWT.Instances () where
+
+import Prelude
+import Control.Arrow
+
+import Crypto.JWT
+import Servant.API.ContentTypes
+
+
+instance MimeRender PlainText SignedJWT where
+  mimeRender _ = encodeCompact
+
+instance MimeRender OctetStream SignedJWT where
+  mimeRender _ = encodeCompact
+
+instance MimeUnrender PlainText SignedJWT where
+  mimeUnrender _ = left (show @Error) . decodeCompact
+
+instance MimeUnrender OctetStream SignedJWT where
+  mimeUnrender _ = left (show @Error) . decodeCompact