IFClite TypeScript API
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    Variable STOREY_ELEVATION_MATCH_TOLERANCE_MConst

    STOREY_ELEVATION_MATCH_TOLERANCE_M: 1

    How far a Z may sit from a storey's elevation and still resolve to it, in metres.

    Beyond this the answer is "no storey" rather than "the least-bad storey": a point 40m above the top floor belongs to no storey, and snapping it to the roof silently corrupts storey grouping, floorplan placement, and section cuts.