Re: unary operators are often best replaced by explicit names, eg: `%*` => toJson

[andrea]

If you have ever tried to write some complex JSON structure in a typed 
language, you will quickly realize that such shortcuts are indeed very useful. 
Now, this is true especially for %, which will be repeated often, while %* is 
only used once per structure. That said, I find %* consistent with %?, and I 
would never deprecate `% for the above reason