Messy usage of static property access

[felixfbecker]

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I saw a lot of messy access to static properties in the code base, i.e. static properties are accessed on the instance with -> or on the instance with :: instead of on the class with ::

[roblourens]

Is this bad practice? I know we use this a lot working with child_names where we don't know the class.

[felixfbecker]

I would make an exception for child_names, but I saw it in other places too

[jens1o]

Is there any activity here?