# for IMAP, undocumented for WWW and may be split off go away
$cb->($qp, $NVRP->new(BYTES, 'bytes:'));
$cb->($qp, $NVRP->new(TS, 'ts:'));
+ $cb->($qp, $NVRP->new(UID, 'uid:'));
while (my ($name, $prefix) = each %bool_pfx_external) {
$qp->add_boolean_prefix($name, $_) foreach split(/ /, $prefix);