Pins c16 and c17 cannot read analog in MicroPython

[kopp]

If using e.g. makecode, it is possible to read analog values from pins c16 and c17, see e.g.

let moisture = 0
basic.forever(() => {
    moisture = pins.analogReadPin(AnalogPin.C16)
    basic.showNumber(moisture)
    control.waitMicros(10000)
})

This does not work in MicroPython, though, as the pins are of type MicroBitDigitalPin (while to read analog they should be of type MicroBitAnalogDigitalPin).

Is it possible to fix this by simply changing the dig_pin to ad_pin in
https://github.com/calliope-mini/calliope-mini-micropython/blob/master/source/microbit/microbitpin.cpp#L64
for pins c16 and c17 or would this break e.g. the UART implementation?