backing_constraints: RuntimeDescriptor<
    [para_id: number],

        | {
            dmp_remaining_messages: number[];
            future_validation_code?: [number, FixedSizeBinary<32>];
            hrmp_channels_out: [
                number,
                { bytes_remaining: number; messages_remaining: number },
            ][];
            hrmp_inbound: number[];
            max_code_size: number;
            max_head_data_size: number;
            max_hrmp_num_per_candidate: number;
            max_pov_size: number;
            max_ump_num_per_candidate: number;
            min_relay_parent_number: number;
            required_parent: Binary;
            ump_remaining: number;
            ump_remaining_bytes: number;
            upgrade_restriction?: UpgradeRestriction;
            validation_code_hash: FixedSizeBinary<32>;
        }
        | undefined,
>

Returns the constraints on the actions that can be taken by a new parachain block.

MMNEPVFCICPMFPCPTTAAATR