public function setSection($fY, ChunkSection $section)
{
if (substr_count($section->getIdArray(), "") === 4096 and substr_count($section->getDataArray(), "") === 2048) {
$this->sections[(int) $fY] = new EmptyChunkSection($fY);
} else {
$this->sections[(int) $fY] = $section;
}
$this->hasChanged = true;
}