To reassure some of you:
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The entirety of the memory managed by DOS is described by a chain of MCBs. The start of the chain is located through the arena_head variable within DOS. Each memory block is immediately followed by the MCB describing the next block, except for the last block in the chain (with the ‘Z’ signature) which has no follower.
Спецборт МЧС России с покинувшими Иран россиянами вылетел из Азербайджана02:10
This callback is also given the key as an argument, which can be useful for cases where the default value is based on the key.