`==` on `Value`s of different shape misbehaves

[lue-bird]

• Encode.object properties
  • Using == on Json.Decode.Values can return True for values that aren’t equal elm/json#30
  • Using == on Json.Decode.Values can throw runtime exceptions elm/json#29
• Comparing nested arrays stored in Json.Value can result in runtime error elm/core#945

Note: It is discouraged to actively call == on js Json.Encode/Decode.Values:

• https://discourse.elm-lang.org/t/function-equality/7538/24
• https://package.elm-lang.org/packages/elm/core/latest/Basics#equality

Should compile-time constraints on == be introduced, Values would be disallowed from being compared, allowing these cases could be ignored.