he R
garbage collection mechanism. To this end, we cannot just save the
environment itself in the obj_tracker (note that in R, an
environment-object is always a pointer to the environment, not the whole
environment itself). If we stored a pointer to the environment itself,
the R garbage collector would never delete the environment as formally
it would still be in use (in the obj_tracker). In order to prevent that,
the following mechanism was implemented:</p>
<ul>
<li>Every HDF5-ID that is in use is wrapped 