PayloadChecksum getRequestConfigXxhash64() {
        Inspector xxhash64Field = getRequestField(REQUEST_CONFIG_XXHASH64);
        return xxhash64Field.valid()
                ? new PayloadChecksum(xxhash64Field.asString(), XXHASH64)
                : PayloadChecksum.empty(XXHASH64);
    }
Contains slime request data objects. Provides methods for reading various fields from slime request data.
All data is read lazily.

@author Ulf Lilleengen
config/src/main/java/com/yahoo/vespa/config/protocol/SlimeRequestData.java