8.1.0: Nullable casting optimization

• Merged PR #131: Inline nullable checks when casting - @thekid

8.0.0: Standalone code, phase 1

This release is the first in a series of releases to make the XP compiler more universally useful: Compiled code now doesn't include generated XP meta information by default, and is thus less dependant on XP Core, see https://github.com/xp-framework/compiler/projects/4.

• Merged PR #129: Add augmentable emitter to create property type checks
  for PHP < 7.4
  (@thekid)
• Fixed private and protected readonly properties being accessible from
  any scope in PHP < 8.1
  (@thekid)
• Merged PR #127: Do not emit XP meta information by default. This is
  the first step towards generating code that runs without a dependency
  on XP core.
  (@thekid)

7.3.0: Static closures

• Merged PR #128: Add support for static closures - @thekid
• Upgraded dependency on xp-framework/ast to version 8.0.0 - @thekid

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)