All of these changes are due bug reports from moltar on github.
You can now specify the values of the primary key. (Issue #1)
The second and third options to load_sims() have been merged into a single second option of "options".
The constraints parameter is now $options->{constraints}
The hooks parameter is now $options->{hooks}
There is now a new $options->{toposort} which allows passing options to the underlying TopoSort implementation. This is primarily useful for self- referential tables.