Reliable type hinting when using AbstractCollection/ArrayCollection/FinderCollection collections

[Xon]

These collection classes result in entity property type hints of;
PHP:

/**
  * @property-read \MyAddon\Entity\Foo[]|\XF\Mvc\Entity\AbstractCollection
  */

This has edge cases where the exact return type doesn't really match and iterating can lose the proper type hint. Especially if calling methods on AbstractCollection

It would be nice if this was;
PHP:

/**
  * @property-read \XF\Mvc\Entity\AbstractCollection<\MyAddon\Entity\Foo>
  */

Thankfully via phpdocs we can do this:

PHP:

/**...

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