The way the UEFI spec defines BOOLEAN is fully compatible to stdbool, so it is perfectly safe to switch to it. Although any other values than 0/1 are undefined by the spec, we could theoretically have cases where a sloppy firmware hands us a bad BOOLEAN (since gnu-efi/edk2 declare it as uint8_t). So any uses where we pass a pointer to BOOLEAN are left untouched.
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