The list of active timers timer_id_dict identifies timers by their numerical id as a string. However this was done using embedded expressions inside the string, which calls num2text with a default of 6 significant figures. This means anything at or above 1 million is expressed in scientific notation.
"timer[1000000]" -> "timer1e+06"
"timer[1000001]" -> "timer1e+06"
Calling num2text manually with 8 significant figures kicks the collision problem down the road to 2^24 (16 million).
nextid is now selectively incremented and is looped back to 1 when reaching the 2^24 threshold.
Also now includes collision checking.
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