pub const REPOS_UNPLACED_WORD: u16 = 0xFF;Expand description
REPOS_UNPLACED at the width the file declares.
Vanilla files carry these fields as WORD while the engine’s read call takes
a BYTE, so the sentinel needs both widths. Written as a literal rather than
widened from its sibling because Into is not const here, and the two are
held together by the assertion below instead.