Modem index increment

[José]

I have noticed that when unplugging and plugging a modem, ModemManager
increases its index by one. This can be annoying when you are trying
to script something.

Would it make sense to assign the same index to the same modem? Maybe
something like using the  "equipment id" field to detect a plugged
modem is not new and use the previous index, instead of increasing it.

Has this been consider before? Are there any arguments for or against it?