Member Junction
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    BitColumnRef: readonly [table: string, column: string]

    One entry in the cross-file BIT/BOOLEAN registry: a [table, column] pair, both LOWERCASED — the wire shape the dialect emits from --collect-bitcols and reads back from MJ_EXTRA_BIT_COLS_FILE ([["entityfield","allowsnull"], …]).

    Previously typed as string[], which type-checked only because the value is passed straight back out as JSON and never indexed — a "Table.Column" string would have serialized fine and silently matched nothing.