sub _remove_if_local { # git->cat_async arg
my ($bref, $oidhex, $type, $size, $self) = @_;
$self->{im}->remove($bref) if $bref;
sub _remove_if_local { # git->cat_async arg
my ($bref, $oidhex, $type, $size, $self) = @_;
$self->{im}->remove($bref) if $bref;