v1.1 Minor optimizations and generic fixes

What's Changed

• Use fast array combine by @szepeviktor in #3
• Fix PHPUnit cache in .gitignore by @szepeviktor in #4
• Use sprintf in exception messages by @szepeviktor in #2
• Improve CI by @szepeviktor in #1
• Fix generics for backedEnum/unitEnum methods by @PrinsFrank in #5

New Contributors

• @szepeviktor made their first contribution in #3
• @PrinsFrank made their first contribution in #5

Full Changelog: v1.0...v1.1