Extension points

phil/slug

The library is plain PHP and declares no service. Its one port is the slugger, and it is changed by decoration.

`Slugger`

Phil\Slug\Slugger — turns a text into a Slug. See Reference.

Method	Contract
`slug(string $text): Slug`	A valid slug, whatever the text; `InvalidSlug` when the text holds no letter or digit a slug can be made of

Point	How
Transliteration and length	`new TransliteratingSlugger($locale, $maxLength)`
Changing what a slugger gives	A decorator: a class implementing `Slugger` that receives the slugger it wraps, calls it, and changes the text before or the slug after; `LeadingWordsRemoved` is one
One slugger per use	`Sluggers`, a slugger by name and a default one: titles, file names, directory entries each get theirs

Slug::fromString() checks and never fixes: a decorator returns a slug built by the slugger it wraps, or one that already follows the rules.