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Size optimize int formatting Let's use the new feature flag! This uses a simpler algorithm to format integers. It is slower, but also smaller. It also saves having to import the 200 byte rodata lookup table. In a test of mine this saves ~300 bytes total of a cortex-m binary that does integer formatting. For a 16KB device, that's almost 2%. Note though that for opt-level 3 the text size actually grows by 116 bytes. Still a win in total. I'm not sure why the generated code is bigger than the more fancy algo. Maybe the smaller algo lends itself more to inlining and duplicating?