Feature request

Consider this example code with a function (playground):

/**
 * @phpstan-type BlockAttributes array{
 *     language: string,
 *     highlightedLines: string,
 *     showLineNumbers: bool,
 *     wrapLines: bool
 * }
 */

/**
 * Render.
 *
 * @param BlockAttributes $attributes Block attributes.
 * @param string          $content    Content.
 * @return string Rendered block.
 */
function render_block( array $attributes, string $content ): string {
	/* ... */
	return $content;
}

PHPStan currently fails here with three errors:

1. Function render_block() has parameter $attributes with no value type specified in iterable type array.
2. PHPDoc tag @param for parameter $attributes with type BlockAttributes is incompatible with native type array.
3. Parameter $attributes of function render_block() has invalid type BlockAttributes.

It seems that the @phpstan-type alias only works when it is attached to a class (playground).

It would be useful if the class association wasn't required.