Error implements Throwable.

\-Error
|-CompileError
| \-ParseError
|-TypeError
| \-ArgumentCountError
|-ValueError
|-ArithmeticError
| \-DivisionByZeroError
|-UnhandledMatchError
\-AssertionError

• The caching part of the CachingIterator
• Handling empty heaps
• PHP 5.5 Generator during iteration

PHP 8.0, Laminas MVC 3.2, Symfony 5.2, Laravel 8.28, PHPUnit 9.5, Doctrine ORM 2.8