[RFC] Type Aliases

Hello Internals, I’d like to request your comments on type aliases (not to be confused with typedefs) at https://wiki.php.net/rfc/typed-aliases TL;DR (it’s actually rather short): Following the same syntax as other use'ing statements, you can alias a type: use type int|float as Number; function sum(Number $a, Number $b): Number { return $a + $b; } You can also include types, with some restrictions: include types 'math-types.php'; function sum(Number $a, Number $b): Number { return $a + $b; } These are compile-time replacements that serve to make code more readable and reduce repetition with no runtime overhead. Type aliases follow the same scoping rules as other use imports. — Rob