- Add `get_entry` method to obtain an entry from binding to a `QuantumCircuit`.
- Add `rebind_equiv` to bind parameters to `QuantumCircuit`

- TODO: Make elements pickleable.

- Remove stray comment.
- Use match instead of matches!.

- Remove required py argument for get_entry.
- Reformat `to_pygraph` to use `add_nodes_from` and `add_edges_from`.
- Other small fixes.

- Use `clone_ref` for the PyObject Graph instance.

- Use `convert_py_to_operation_type` to correctly extract Gate instances into rust operational datatypes.
- Add function `get_sources_from_circuit_rep` to not extract circuit data directly but only the necessary data.
- Modify failing test due to different mapping. (!!)
- Other tweaks and fixes.

- Attributes from CircuitRep are only written once, reducing the overhead.
- Modify `__setstate__` to avoid extra conversion.
- Remove `get_sources_from_circuit_rep`.

- Use `__getnewargs__ instead.

- Use python structures to avoid extra conversions.
- Add rust native `EquivalenceLibrary.keys()` and have the python method use it.

- Use a `py` token instead of `Python::with_gil()` for `rebind_params`.
- Other tweaks and fixes.

- Accept `Operations` and `[Param]` instead of the custom `GateOper` when calling from rust.
- Build custom `GateOper` inside of class.

- Add `node_index` Rust native method.
- Use python set comparison for `Param` check.

- Fix comparison methods for `Key`, `Equivalence`, `EdgeData` and `NodeData` to account for the removal of `PartialEq` for `Param`.

…t` intructions in rust.

- Change implementation of `CircuitRef, to leverage the use of `CircuitData`.

- Add `py_clone` to perform shallow clones of a `CircuitRef` object by cloning the references to the `QuantumCircuit` object.
- Extract `num_qubits` and `num_clbits` for CircuitRep.
- Add wrapper over `add_equivalence` to be able to accept references and avoid unnecessary cloning of `GateRep` objects in `set_entry`.
- Remove stray mutability of `entry` in `set_entry`.

- The equivalence library will now only store `CircuitData` instances as it does not need to call python directly to re-assign parameters.
- An `IntoPy<PyObject>` trait was adapted so that it can be automatically converted to a `QuantumCircuit` instance using `_from_circuit_data`.
- Updated all tests to use register-less qubits in circuit comparison.
- Remove `num_qubits` and `num_clbits` from `CircuitRep`.

- Add `from_operation` constructor for `Key`.
- Made `py_has_entry()` private, but kept its main method public.
- Made `set_entry` more rust friendly.
- Modify `add_equivalence` to accept a slice of `Param` and use `Into` to convert it into a `SmallVec` instance.

- Add method to immutably borrow the `EquivalenceLibrary`'s graph.

- Using large int as the key's number of qubits breaks compatibility with qpy, use a random string instead.