Why so big EFI partition?

[Albin Otterhäll <Albin@Otterhall.com>]

When doing a guided partition when installing debian, the
debian-installer creates a EFI (/boot/efi) partition with approximately
500MB, and a /boot partition with around 250MB. Why this weird ratio
between them?

To my knowledge only the bootloader(s) in located on the /boot/efi
partition, and the kernel images on /boot. Canonical says that 100MiB is
minimum for Ubuntu's EFI partition, and 200MiB is recommended.

And on a related note: Does debian-installer support *iB units?

Thanks in advance!

Regards,
Albin