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Why is the Leonardo bootloader bigger than Uno's?

Apparently, Leonardo and Uno are very similar boards.

However, despite that, and both have the same flash memory size, the Leonardo bootloader is considerably bigger than the Uno bootloader (4 KB vs. 0.5 KB).

What would be the reason? Is there a way to use a smaller bootloader on the Leonardo?

Uno specifications: UNO R3

Leonardo specifications: Leonardo

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