Error implements Throwable.

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

• Sort your data for each country individually
• PHP XSLTProcessor
• Make Intl component classes throw exceptions on error

PHP 7.4, Zend 3.0, Symfony 4.3, Laravel 5.8, PHPUnit 8.0, Doctrine 2.10