inline operator fun <T : Any> PersistentDataContainer.set(key: Key, obj: T?) Writes obj under key as T using CBF. If obj is null, removes key from the container.
fun <T : Any> PersistentDataContainer.set(key: Key, serializer: BinarySerializer<T>, obj: T?) Writes obj under key as T using serializer. If obj is null, removes key from the container.