# $creat may be any true value, or 0/undef. A hashref is true,
# and $creat->{nproc} may be set to an integer
my ($class, $v2ibx, $creat) = @_;
# $creat may be any true value, or 0/undef. A hashref is true,
# and $creat->{nproc} may be set to an integer
my ($class, $v2ibx, $creat) = @_;