Why is there a minimal disk size?

[dragetd]

quickemu/quickemu

Line 2599 in 52da5f9

readonly DISK_MIN_SIZE=$((197632 * 8))

This is suspiciously just above the size of a fresh overlay disk. I used a base disk and on purpose prepared the VM disk in the config by pointing at an overlay file. Without any writes, the file is so small, that I get:

[nix-shell:~/temp/cage]$ quickemu --vm cage.conf
Quickemu 4.9.9 using /nix/store/k5lbf6j3j11z45536lqqr963510962dg-qemu-10.1.5/bin/qemu-system-x86_64 v10.1.5
 - Host:     NixOS 25.11 (Xantusia) running Linux 6.19.9-zen1 x
 - CPU:      AMD x
 - CPU VM:   host, 1 Socket(s), 2 Core(s), 2 Thread(s)
 - RAM VM:   8G RAM
 - BOOT:     EFI (Linux), OVMF (/nix/store/k5lbf6j3j11z45536lqqr963510962dg-qemu-10.1.5/share/qemu/edk2-x86_64-code.fd), EFI Vars (x/OVMF_VARS.fd), SecureBoot (off).
 - Disk:     x/x.qcow2 (16G)
             Looks unused, booting from 
ERROR! You haven't specified a .iso or .img image to boot from.

Also, I have display="none" in my config. The check does not happen if I remove this line, so somehow this check only happens when I do not set a display. That seems like a bug, or?