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=head1 DESCRIPTION

This package ties hash so that the keys are the names of variables in the caller's
namespace.  If the variable does not exist, then attempts to access it will die.

An alternative namespace can be specified, if needed:

  tie %hash, 'Tie::InsideOut', 'Other::Class';

This gives a convenient way to restrict valid hash keys, as well as provide a
transparent implementation of inside-out objects, as with L<Class::Tie::InsideOut>.

This package also tracks which keys were set, and attempts to delete keys when an
object is destroyed so as to conserve resources. (Whether the overhead in tracking
used keys outweighs the savings is yet to be determined.)

Note that your keys must be specified as C<our> variables so that they are accessible
from outside of the class, and not as C<my> variables.

=head2 Serialization