If speed & accuracy are important, look at:

    www.polyarc.us/pack

    www.polyarc.us/packer.js

It uses integer arithmetic for speed.  It eliminates Lat/Lon
projection bias for accuracy.  It has no function calls in the main
loop.  It converges quickly with multiple pivots in the same pass.  It
compensates for a Douglas-Peucker algorithm deficiency (D-P was
designed for polylines not for polygons).

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