Status: IN
Internal page wire format is [type:1B][num_keys:2B][child0:4B] followed by repeating [keylen:2B][key:varB][child:4B], all big-endian with no alignment padding; this interleaved layout mirrors the logical separator-pointer structure.
Source: entries/2026/05/29/b-tree-storage-engine-btree-_serialize_internal.md