Bug Functions which use func_get_args should be typehinted with 'mixed ... $arguments'

[Xon]

For example in AbstractCollection::unshift is defined as:

PHP:

/**
 * @return AbstractCollection<T>
 */
public function unshift()

The phpdocs can be updated to indicate what can be added, like this:
PHP:

/**
 * @param T ...$arguments
 * @return AbstractCollection<T>
 */
public function unshift()

I've attached a git patch file which implements this (since I'm using this patch locally since I wanted the type hinting)

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