Implements :php:interface:`Ramsey\\Uuid\\Fields\\FieldsInterface`.

Rfc4122\\FieldsInterface represents the fields of an `RFC 9562`_ (formerly `RFC 4122`_) UUID. In addition to the
methods defined on the interface, this class additionally defines the following methods.

.. php:method:: getClockSeq()

    :returns: The full 16-bit clock sequence, with the variant bits (two most significant bits) masked out.
    :returntype: Ramsey\\Uuid\\Type\\Hexadecimal

.. php:method:: getClockSeqHiAndReserved()

    :returns: The high field of the clock sequence multiplexed with the variant.
    :returntype: Ramsey\\Uuid\\Type\\Hexadecimal

.. php:method:: getClockSeqLow()

    :returns: The low field of the clock sequence.
    :returntype: Ramsey\\Uuid\\Type\\Hexadecimal

.. php:method:: getNode()

    :returns: The node field.
    :returntype: Ramsey\\Uuid\\Type\\Hexadecimal

.. php:method:: getTimeHiAndVersion()

    :returns: The high field of the timestamp multiplexed with the version.
    :returntype: Ramsey\\Uuid\\Type\\Hexadecimal

.. php:method:: getTimeLow()

    :returns: The low field of the timestamp.
    :returntype: Ramsey\\Uuid\\Type\\Hexadecimal

.. php:method:: getTimeMid()

    :returns: The middle field of the timestamp.
    :returntype: Ramsey\\Uuid\\Type\\Hexadecimal

.. php:method:: getTimestamp()

    :returns: The full 60-bit timestamp, without the version.
    :returntype: Ramsey\\Uuid\\Type\\Hexadecimal

.. php:method:: getVariant()

    Returns the variant, which, for `RFC 9562`_ (formerly `RFC 4122`_) variant UUIDs, should always be the value ``2``.

    :returns: The UUID variant.
    :returntype: ``int``

.. php:method:: getVersion()

    :returns: The UUID version.
    :returntype: ``int``

.. php:method:: isNil()

    A *nil* UUID is a special type of UUID with all 128 bits set to zero. Its string standard representation is
    always ``00000000-0000-0000-0000-000000000000``.

    :returns: True if this UUID represents a nil UUID.
    :returntype: ``bool``