our $CHUNKSIZE = 64 * 1024;
# XXX - this is only here for compat, do not use!
-has env => ( is => 'rw', writer => '_set_env' );
+has env => ( is => 'rw', writer => '_set_env' , weak_ref=>1);
my $WARN_ABOUT_ENV = 0;
around env => sub {
my ($orig, $self, @args) = @_;