PHP 8.0 INTERNALS UPGRADE NOTES

1. Internal API changes
  a. Object Handlers API
  b. ZEND_OVERLOADED_FUNCTION and corresponding call_method() object handler

2. Build system changes
  a. Abstract
  b. Unix build system changes
  c. Windows build system changes

3. Module changes

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1. Internal API changes
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  a. Object Handlers API and some related functions, e.g. zend_call_method() and
     zend_objects_clone_obj() were changed to receive zend_object* instead of
     zval* and zend_string* instead of zval* for property names.

  b. ZEND_OVERLOADED_FUNCTION and corresponding call_method() object handler
     were removed. ZEND_INTERNAL_FUNCTION with ZEND_ACC_CALL_VIA_HANDLER and
     defined "handler" callback should be used instead. This "handler" callback
     should also take care about function cleanup. See ext/zend_test/test.c
     for example.

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2. Build system changes
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  a. Abstract

  b. Unix build system changes

  c. Windows build system changes

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3. Module changes
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