You guys may find the improvments we have done over the years useful: 
http://leves.web.elte.hu/squeak/JSON-ul.45.mcz

Levente

On Wed, 17 Aug 2016, Tony Garnock-Jones wrote:

> Hi Fabio, Hannes,
>
> On 08/17/2016 01:37 PM, Fabio Niephaus wrote:
>>    > I'm not sure if it's a good idea to test if this equals a new
>>     dictionary
>>    > here.
>
> And yet, just checking that it is a dictionary isn't quite right either.
> I've changed it now to compare against JsonObject new.
>
> (It feels weird to me that Dictionary>>equals: should compare species :-/ )
>
> I'll update SqueakMap per the instructions Hannes sent me.
>
> Thanks!
>
> Tony
>
>