[Microbit-Python] Slowness as integers move beyond 256

[M.-A. Lemburg]

I've been playing with MicroPython a bit and noticed a strange
behavior: integer math gets rather slow when reaching numbers
above 256.

Run the attached script as example. It produces a wave on the
LED display and runs quite nicely until the offset reaches 251.
Performance then drops to about half the speed.

-- 
Marc-Andre Lemburg
eGenix.com

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