Support uppercase-string

[VincentLanglet]

In the same way psalm supports lowercase-string PHPStan does.
But PHPStan also supports uppercase-string. (phpstan/phpstan-src#3613)
https://phpstan.org/r/1bb5f514-6781-48a8-a775-70c8fbe8bb3a

Psalm currently does not understand the type https://psalm.dev/r/f5835a8213

When using both PHPStan and Psalm it's kinda annoying since it forces to use double annotation.

It would be great to supports uppercase-string for psalm too, but I feel like it may be more complicated in PHPStan because

• PHPStan use an array of accessory (non-empty, non-falsy, lowercase, numeric, uppercase, literal, ...) so can easily represente any intersection of those types.
• Psalm use a class for every existing intersection. So psalm has TNonEmptyString, TNonFalsyString, TNumericString, TLowercaseString, TNonEmptyLowercaseString, but is already missing classes like TNonFalsyLowercaseString, TNonFalsyNumericString (to exclude 0), TNumericLowercaseString (if you need to exclude 10E2) and introducing TUppercaseString would require multiple new classes (knowning that even TLowercaseUppercaseString is technically possible for string without letter like numbers or special characters).

So at least would it be easily possible for Psalm to consider uppercase-string as an alias for string, in order to avoid using double annotation when using both PHPStan and psalm ?

[psalm-github-bot]

I found these snippets:

https://psalm.dev/r/f5835a8213

<?php

/**
 * @param uppercase-string $string
 *
 * @return uppercase-string
 */
function foo(string $string) {
    return $string;
}

Psalm output (using commit c7c5a69):

ERROR: InvalidDocblock - 4:11 - Unrecognized type uppercase-string in docblock for foo

ERROR: InvalidDocblock - 8:1 - Unrecognized type uppercase-string in docblock for foo

INFO: MissingReturnType - 8:10 - Method foo does not have a return type, expecting string