/**
 * Sutherland-Hodgman clip of `points_in` against the axis-aligned
 * half-plane `coord_idx ≤ bound` (or `coord_idx ≥ bound` when
 * `keep_below` is false). 2D stride 2; result to `points_out`.
 * Returns surviving vertex count.
 *
 * @param {Float64Array} points_in
 * @param {number} point_count
 * @param {Float64Array} points_out
 * @param {number} coord_idx 0 = u, 1 = v
 * @param {number} bound
 * @param {boolean} keep_below true to keep points with coord ≤ bound
 * @returns {number} surviving vertex count
 */
export function clip_against_axis_uv(points_in: Float64Array, point_count: number, points_out: Float64Array, coord_idx: number, bound: number, keep_below: boolean): number;
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