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Topic on Talk:Best practices for extensions

Summary by Krinkle

Added.

Smalyshev (WMF) (talkcontribs)

One thing that should be avoided even more than global state (e.g. global variables/public static properties in classes) is local static vars and similar instances of hidden local state, especially when used for caching. It looks like a very good idea when writing it, and is absolute nightmare when debugging/testing, because it creates hidden un-clearable state which could be in any random configuration when you get to it.

Thiemo Kreuz (WMDE) (talkcontribs)
Krinkle (talkcontribs)

I've made the point about global state explicit in this edit.