Under older perls this module provides a drop in compatible api to
Hash::Util::FieldHash using perltie. When Hash::Util::FieldHash is available it
will use that instead.

This way code requiring field hashes can benefit from fast, robust field hashes
on Perl 5.10 and newer, but still run on older perls that don't ship with that
module.

See Hash::Util::FieldHash for all the details of the API.

Author:
-------
Yuval Kogman