decode Lines
fun decodeLines(feature: MvtFeature, z: Int, x: Int, y: Int, extent: Int, simplify: Boolean = true, scratch: MvtGeometry.Scratch): List<DoubleArray>
Inflate a LINESTRING feature into polylines (each MoveTo starts a new one), each a flat interleaved [lon°, lat°, …] degree array — no per-vertex Position; altitude dropped.