GeoLeaf Core API - v3.0.0
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    SubLayerType:
        | "fill"
        | "fill-extrusion"
        | "line"
        | "circle"
        | "symbol"
        | "casing"
        | "clusters"
        | "cluster-count"

    The kinds of MapLibre sub-layer one GeoLeaf layer can expand into.

    A single declared layer becomes several MapLibre layers — fill, outline, symbol — which is why visibility and style operations iterate rather than address one id.