Dual Seven Segment display madness

Preamble

One day, in March 2015, whilst shopping for Arduino bits and pieces in Ban Mo, an electronics street market in BKK, I came across a large sheet of polystyrene bejewelled in Sanyo SL-1255-30 two digit seven segment displays, for 5 Baht each, which was displayed in the street outside a shop. I purchased one of the seven segment displays, took it home, and eventually realised that no libraries existed for the common anode device. So I promptly set about writing my own sketch, which then evolved into an Arduino Library that was developed over the course of a couple of weeks. This is that library.

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