7.2.1: Native callable syntax fix

• Fixed PHP 8.1 not emitting native callable syntax - @thekid
• Fixed isConstant() for constant arrays - @thekid

7.2.0: Array unpack optimization

• Optimized generated code for arrays including unpack expressions for
  PHP 8.1+, which natively supports unpacking with keys. See
  https://wiki.php.net/rfc/array_unpacking_string_keys
  (@thekid)

7.1.0: Preliminary PHP 8.2 support

• Added preliminary PHP 8.2 support by fixing various issues throughout
  the code base and adding a PHP 8.2 emitter.
  (@thekid)

7.0.0: Drop XP 9 and lower, add XP 11

• Made compatible with XP 11 - @thekid
• Implemented xp-framework/rfc#341, dropping compatibility with XP 9
  (@thekid)

6.11.0: Callable new syntax

• Merged PR #125: Support new T(...) callable syntax - @thekid

6.10.0: Target runtimes

• Implemented feature request #123: Use php:X.Y instead of PHP.X.Y
  for target runtimes. The older syntax is still supported!
  (@thekid)

6.9.0: Readonly properties

• Merged PR #124: Add support for readonly properties. Implements feature
  request #115, using native code for PHP 8.1 and simulated via virtual
  properties for PHP 7.X and PHP 8.0
  (@thekid)

6.8.3: Promoted property types fix

• Fixed types not being emitted for promoted properties - @thekid

6.8.2: Extraneous operators fix

• Fixed Call to undefined method ...::emitoperator()) which do not
  provide any context as to where an extraneous operator was encountered.
  (@thekid)

6.8.1: Enum constants fix

• Fixed issue #122: Undefined constant Sources::FromEmpty (when using
  PHP 8.1 native enumerations in PHP 8.0 and lower and the JIT compiler)
  (@thekid)