raspberrypi: IncrementalEncoder.deinit() locks up?

running `Adafruit CircuitPython 6.2.0-rc.0-60-g27d883286-dirty on 2021-04-04; Adafruit Feather RP2040 with rp2040`

At the repl, run
```python
import rotaryio
import microcontroller.pin as p
r = rotaryio.IncrementalEncoder(p.GPIO1, p.GPIO2)
r.deinit()
```
At the last line, the board will freeze.