exactly

**type**: ``integer``

This option is the exact length value. Validation will fail if

the given value's length is not **exactly** equal to this value.

.. note::

This option is the one being set by default when using the Length constraint

without passing any named argument to it. This means that for example,

``@Assert\Length(20)`` and ``@Assert\Length(exactly=20)`` are equivalent, as

well as ``#[Assert\Length(20)]`` and ``#[Assert\Length(exactly: 20)]``.

.. versionadded::

The named argument ``exactly`` was introduced in Symfony 5.2.