ref $fh yields IO::Scalar
$fh->can("opened")? yes
$fh->can("seek")? yes
$fh->can("seekable")? yes
$fh is IO::Scalar? yes
$fh->can("opened")? yes
$fh->opened()? yes
$fh->can("seek")? yes
$fh->seek(0, 0)? yes
$fh is tied? no