3.0: Into the future

• Minimal PHP version is now 7.0. All versions of PHP up to and including 8.6 are supported.
• Added new operations: append, prepend, concat.
• Improved type hints by @jorrit, @umpirsky et al. in #49, #55, #56 etc.
• Implemented JsonSerializable to enable automatic conversion to array in json_encode by @jorrit in #50.
• Performance improvements, bug fixes in #11, #59 etc.
• Improved CI by @sanmai et al. in #42, #69 etc.

Breaking changes 2.x → 3.x

Full changelog