“It is very challenging to compress code in small memory micro-controller unit (MCU) such as Digispark ATtiny85, which is offering only 6kB. Suppose you want to attach it to a tiny OLED (128x32 pixels) and make it write easily readable huge fonts (16x32 pixels WxH). And after this feast, you may still want to make the Attiny85 do, more than simply writing something! This means: leave memory available from the 6kB!”