Encoding an object with circular dependencies throws an Error.

[ChristophP]

When one is passing an object with circular dependencies from JS to Elm and then calls Json.Encode.encode on the Value you get a runtime Error from within Elm.

Of course the source of the error is from JS land but it would be nice if Elm gave a better Error message and log something like "<Json with circular references>" rather than a stack trace. Maybe the JSON.stringify call could be put in a try/catch or something. It's not a huge issue but I have encountered this error multiple times when people were printing stuff for debugging and it would be helpful if Elm told them the source of their error right away.

SSCCE:

-- Elm
module Main exposing (..)

import Browser
import Html exposing (text)
import Json.Encode as JE


type alias Model =
    {}

type Msg
    = NoOp

init : JE.Value -> ( Model, Cmd Msg )
init flags =
  let _ = JE.encode 2 flags -- will cause an infinite recursion
  in
    ( {}, Cmd.none )

main : Program JE.Value Model Msg
main =
    Browser.document
        { view = \_ -> { title="SSCCE", body = [  text "this will crash" ] }
        , init = init
        , update = \msg model -> (model, Cmd.none)
        , subscriptions = always Sub.none
        }

// JS
Elm.Main.init({ flags: window });