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diff --git a/src/Mapbox/Cmd/Internal.elm b/src/Mapbox/Cmd/Internal.elm
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+module Mapbox.Cmd.Internal exposing (..)
+
+import Json.Encode as Encode exposing (Value)
+
+
+{-| Options use phantom types to show which commands support them.
+-}
+type Option support
+    = Option String Value
+
+
+{-| -}
+type Supported
+    = Supported