The JSON module can only encode Perl data structures directly representable
as JSON strings: simple scalars, arrayrefs and hashrefs.

This module transforms a perl data structure into one which may safely
be JSON encoded, while maintaining Perl-specific metadata that isn't directly
expressible in JSON such as blessed and tied references, self-referential
data, typeglobs, reference addresses, etc.

When deserializing, it recreates the original data as closely as possible.

It also includes a Javascript library to manipulate the data structure
created from the JSON string.