An array record's hash is one per field type in a document (every
array the base game's files hold follows this, and each such hash is a
key of the document's reflection group table, now read). A new array
takes the hash of an existing array of the same holding type and field;
callers can ask the writer to refuse when there is none, and the mod
merge keeps the old fallback. Checked on the game's own
level documents.
Dave Johnson
9dbcef7557