2.0.9

What's Changed

• 🐛 Narrow only by existing return types by @dpi in #903
• Migrate PHPUnit configuration across PHPUnit major versions by @dpi in #907
• IDs can be strings, RevisionableStorageInterface::deleteRevision should accept string ids by @dpi in #904
• ✨ Narrow return value of getLinkTemplate by whether hasLinkTemplate was called beforehand by @dpi in #906
• ✨ Narrow return value of getKey by whether hasKey was called beforehand by @dpi in #905

Full Changelog: 2.0.8...2.0.9