Function: to_json

--Usage--
> to_json(some_script_value)

Convert a [[type:list]], a [[type:map]], a [[type:card]], a [[type:keyword]], a [[type:pack_type]] or a [[type:set]] to a JSON string.


--Parameters--
! Parameter	Type				Description
| @input@	some_script_value		MSE script value to convert to a JSON string.
| @set@		[[type:set]]		The active set. This can be omited since "set" is a predefined variable.

--Examples--
> to_json(card)

--See also--
| [[fun:from_json]]		Convert JSON text to an MSE script value.
