Error implements Throwable.

\-Error
|-CompileError
| \-ParseError
|-TypeError
| \-ArgumentCountError
|-ArithmeticError
| \-DivisionByZeroError
|-AssertionError
\-PhpParser\ErrorHandler\Throwing

• Second parameter of count function doesn't affect Countable
• Filtering elements of an Iterator
• Make Intl component classes throw exceptions on error

PHP 7.3, Zend 3.0, Symfony 4.3, Laravel 5.8, PHPUnit 8.0, Doctrine 2.10