• requires PHP 7.0
• uses declare(strict_types=1)
• uses PHP 7.0 scalar and return type hints
• some classes & members marked as final (BC break)
• Method: empty body is NULL instead of FALSE (BC break)
• Helpers::formatArgs() checks for insufficient number of placeholders (BC break)
• Parameter::setDefaultValue() automatically sets setOptional(), setOptional is deprecated (BC break)

• PhpNamespace: global namespace represents '' instead of NULL (BC break)
• PhpNamespace::__construct() $name is mandatory, setName() triggers warnings (BC break)

• new deprecated stuff triggers warnings b357b90