What is the default I/O state of the pins?

When the Spark Core powers up, what is the default state of all the I/O pins. Are they set as inputs ?

See here, default pinMode is NONE for all pins.
https://github.com/spark/core-firmware/blob/master/src/spark_wiring.cpp#L55

If I had to guess what NONE means, I’d say it’s probably high impedance (i.e. Floating / Open).

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Assuming that you’ve got Tinker loaded on your Core, @BDub’s answer is correct: