[BUG] Samples on qutrit device are floats instead of integers

[dwierichs]

Expected behavior

The basis state indices sampled by qml.sample are integers.

Actual behavior

The basis state indices sampled by qml.sample are converted to floats within _qubit_device.py::QubitDevice.statistics because the _asarray method is called on them.

Additional information

No response

Source code

dev = qml.device("default.qutrit", wires=1, shots=1)
@qml.qnode(dev)
def circ():
    return qml.sample(wires=0)

circ()

Tracebacks

tensor(0., requires_grad=True)

System information

pl dev

Existing GitHub issues

• I have searched existing GitHub issues to make sure the issue does not already exist.

[mudit2812]

This is not impacting correctness in any way, and is an artifact of the strategy we use to track execution for backprop differentiation. So, I'm closing this issue.