turns C<undef> here.
=cut
sub get_time { undef }
=head2 TO_JSON()
Meant to be called by the L<JSON> family of modules to create a JSON
representation of the OID. So, for example, "4162F712-1DD2-11
"4162F712-1DD2-11B2-B17E-C09EFE1DC403" }>.
my $json = JSON->new->allow_blessed->convert_blessed;
$json->encode(MorboDB::OID->new);
=cut
sub TO_JSON { { '$oid' => shift->value } }
sub _build_valu