pub const SHM_SLOT_OVERHEAD: usize = _; // 16_384usizeExpand description
NDN Data packet wire overhead above the raw content bytes:
Data TLV + Name + MetaInfo + SignatureInfo + SignatureValue. 16 KiB
is generous enough to cover a Data whose content is mtu bytes of
payload plus a long name and a large signature (Ed25519, ECDSA with
key locator, or a Merkle proof up to a few hundred hashes).