Can't set measurements with len=1 NumPy array

[nonhermitian]

Environment

• Qiskit Terra version: lastest
• Python version:
• Operating system:

What is happening?

This fails for len=1 arrays:

qc = QuantumCircuit(2, 1)
qc.measure([0], np.array([0]))

~/mambaforge/envs/qiskit/lib/python3.8/site-packages/qiskit/circuit/quantumcircuit.py in _bit_argument_conversion(bit_representation, in_array)
   1106             raise CircuitError("Index out of range.") from ex
   1107         except TypeError as ex:
-> 1108             raise CircuitError(
   1109                 f"Type error handling {bit_representation} ({type(bit_representation)})"
   1110             ) from ex

CircuitError: "Type error handling [0] (<class 'numpy.ndarray'>)"

For length 2 or higher it works. Also works if cast to list.

How can we reproduce the issue?

See above

What should happen?

It should work for any length array

Any suggestions?

No response

[jakelishman]

>>> int(np.array([0]))
0

???

Seems like pretty weird Numpy behaviour, but that's where the issue comes in. Should be an easy fix.