The option is automatically enabled whenever a route or a requirement uses any

non-ASCII UTF-8 characters or a `PCRE Unicode property`_ (``\p{xx}``,

``\P{xx}`` or ``\X``). Note that this behavior is deprecated and a

`LogicException` will be thrown instead in 4.0 unless you explicitly turn

on the `utf8` option.

``LogicException`` will be thrown instead in 4.0 unless you explicitly turn

on the ``utf8`` option.

..tip::