Revision history for JSON-MaybeXS
+ - document when is_bool became available
+
1.004000 - 2018-04-19
- added true and false subs so they can be used via JSON::MaybeXS rather than
only JSON() exported sub.
a class method like the other interfaces; it must be called as a function, with
no invocant. It supports the representation used in all JSON backends.
+Available since version 1.002004.
+
=head1 CONSTRUCTOR
=head2 new