SparseRangeSpec

interface SparseRangeSpec {
  /** Parallel deck ids: two entries per combo (hero villain hole cards). */
  indices: number[] | Int32Array | Uint32Array;
  weights: number[] | Float64Array; // F64VectorInput
}

Used by exactHuEquityVsRange, simulateEquityVsRange, and equityDeltaIfCardRemoved. See Sparse range input.