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I noticed while trying to add Arduino Zero support for Firmata that the following line fails: https://github.com/firmata/arduino/blob/master/examples/StandardFirmata/StandardFirmata.ino#L266.
After that point, digital input will not work on that pin (it's not permanently broken as in fried input pin or anything like that though). This has never been an issue for other architectures.
One one hand this points out that I need to update the Firmata implementation to use INPUT_PULLUP, something I should have probably added long ago. On the other hand this is an inconsistency so just calling that out.