9.3.2: Match expressions fix

• Fixed empty match expressions and match expressions with default
  case only in PHP 7
  (@thekid)
• Added tests verifying closures are supported in constant expressions
  https://wiki.php.net/rfc/closures_in_const_expr
  (@thekid)

9.3.1: References & reflection fix

• Fixed private(set) not being implicitely marked as final, see
  https://wiki.php.net/rfc/asymmetric-visibility-v2#inheritance
  (@thekid)
• Fixed enclosing scopes when using references - @thekid

9.3.0: PHP 8.4 emitter

• Fixed checks for property hooks emulation with asymmetric visibility
  (@thekid)
• Added PHP 8.4 emitter which natively emits property hooks and asymmetric
  visibility syntax. This is integration-tested with PHP 8.4.0 Beta 4.
  See https://github.com/php/php-src/blob/php-8.4.0beta4/NEWS
  (@thekid)
• Changed emitter to use native readonly classes in PHP 8.2, fixing an
  inconsistency with accessing undefined properties
  (@thekid)

9.2.0: Asymmetric visibility

• Merged PR #183: Add emitting support for asymmetric visibility. See
  https://wiki.php.net/rfc/asymmetric-visibility-v2, targeted for PHP 8.4
  (@thekid)

9.1.1: Forward compatibility fix

• Forward compatibility with newer xp-framework/ast releases - @thekid

9.1.0: Property hooks

• Merged PR #166: Implement property hooks via virtual properties, see
  https://wiki.php.net/rfc/property-hooks. Includes support for native
  implementation, which is yet to be merged (php/php-src#13455). Thus,
  this still might be a moving target in some regards!
  (@thekid)

9.0.0: XP 12 compatibility

• Merged PR #179: XP 12 compatibility, dropping PHP 7.0 - 7.3 support!
  (@thekid)
• Removed deprecated lookup() from lang.ast.emit.GeneratedCode
  (@thekid)

8.17.2: Implicitely nullable type fix

• Fixed implicitely nullable type warnings for parameters with non-
  constant expressions (e.g. $param= new Handle(0)) in PHP 8.4, see
  https://wiki.php.net/rfc/deprecate-implicitly-nullable-types
  (@thekid)

8.17.1: Closure emitting fix

• Fixed emitting captures and return types for closures - @thekid

8.17.0: Locals fix & performance

• Merged PR #177: Remove Result::$stack. Use local variables for backing
  up and restoring locals instead. Slight performance improvement.
  (@thekid)
• Fixed issue #176: Lambda parameters bleeding into locals - @thekid