pub const PAGING_MAGIC_V2: u64 = 0x5041_4745_0000_0002;Expand description
The ONLY accepted first u64 on the RW paging port (“PAGE” + 2, v2-only
): after the magic comes a [u8 kind] byte so ONE peer serves
a registry of per-(kind, shape) arenas, then [u64 arena_bytes]
[u64 blob_bytes] — blob_bytes == 0 selects the RAW one-sided mode.