compareTo(chunkGraph, otherGroup) {
		if (this.chunks.length > otherGroup.chunks.length) return -1;
		if (this.chunks.length < otherGroup.chunks.length) return 1;
		return compareIterables(compareChunks(chunkGraph))(
			this.chunks,
			otherGroup.chunks
		);
	}
Sorting predicate which allows current ChunkGroup to be compared against another.
Sorting values are based off of number of chunks in ChunkGroup.
@param {ChunkGraph} chunkGraph the chunk graph
@param {ChunkGroup} otherGroup the chunkGroup to compare this against
@returns {-1|0|1} sort position for comparison