1.4.0

What's Changed

Bug Fixes

• Fix DateTimeImmutable not being formatted — use instanceof \DateTimeInterface instead of get_class() string comparison (#9, #17)
• Handle null, boolean, and nested array values gracefully (#15, #18)
  • null → empty string
  • bool → "true" / "false" strings
  • Nested arrays → InvalidArgumentException with clear message

Improvements

• Modernize CI: add PHPStan, php-cs-fixer, split jobs (#16)
• Rewrite README with modern structure and documentation
• Add PR templates and modernize issue templates

Full Changelog: 1.3.0...1.4.0