Create an empty json object with std.json

[Andrea Fontana via Digitalmars-d-learn]

On Friday, 22 January 2016 at 16:45:22 UTC, userABCabc123 wrote:
> But soon or later you'll need to add values to your object so 
> just imagine it's already an object, even if it will only 
> become one when you'll start to add some values.

You're wrong, I need an empty object for an API call!

Moreover "{}" it's a valid json object and there's no easy way to 
create it using std.json.