Backwards-compatible reads

[haf]

A default function for 'this property might not exist, because it was introduced later:

  (fun ... -> ())
   <!> // ...
   <*> (Json.bind (Json.tryRead "images")
                  (function | None -> Json.init []
                            | Some x -> Json.init x))

By default I think it's a good idea to be backwards-compatible with schema, so if the library's user knows that a property has been introduced later, then there should be an easy way (i.e. one that doesn't require reasoning about the monad's structure) to read that properly optionally, like above.

[kolektiv]

Yeah, that seems useful - something like a function Json.readOrDefault if that's possible? It would make sense to have that I agree. How does 'readOrDefault' sound to you, and would that be the right thing?

[haf]

Yes, that sounds about right!

[kolektiv]

I'll have a look at it later on then and try and push it as a 4.1 :)

[haf]

Nice