Environment

• Qiskit Terra version: 0.25.0 (main)
• Python version: 3.9
• Operating system: Windows

What is happening?

Channel index validation doesn't produce a PulseError when the channel is either non-integer or negative. Only when both are true.

How can we reproduce the issue?

The following should produce a PulseError, but it doesn't:

from qiskit import pulse

pulse.DriveChannel(0.5)
pulse.DriveChannel(-1)

Because of this line, only when the index is both not an integer and negative, an error is raised. This does raise a PulseError:

pulse.DriveChannel(-1.5)

What should happen?

A PulseError should be raised if either of the conditions are met.

Any suggestions?

No response