- number ret = bindings.ReplyChannelRange_new(chain_hash_arg, first_blocknum_arg, number_of_blocks_arg, sync_complete_arg, short_channel_ids_arg);
+ number ret = bindings.ReplyChannelRange_new(InternalUtils.check_arr_len(chain_hash_arg, 32), first_blocknum_arg, number_of_blocks_arg, sync_complete_arg, short_channel_ids_arg);