Port Elm's Json.Decode

README.md

@@ -1,2 +1,9 @@
 # json-extra
-Facilitating JSON encoding and decoding by copying Elm's equivalent package
+
+Facilitating JSON encoding and decoding by copying Elm's equivalent package.
+
+This package aims to port
+[Json.Decode](https://package.elm-lang.org/packages/elm/json/latest/Json.Decode)
+and
+[Json.Encode](https://package.elm-lang.org/packages/elm/json/latest/Json-Encode)
+to N.

decode/error.n

@@ -0,0 +1,10 @@
+import json
+
+/// A decoding error type that describes precisely how an error happened. This
+/// can be used to make more elaborate visualizations of a decoding error. For
+/// example, you could show a preview of the JSON object and highlight the
+/// invalid parts in red.
+type pub error = pub <field str error>
+	| pub <index int error>
+	| pub <oneOf list[error]>
+	| pub <failure str json.value>