We have very complicated templates on donatewiki, that do things like read from GET query parameters. Perhaps we should consider porting some of the trickier stuff to Lua.
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Donate wiki is a bit of a mess, but it's stable. Also it's now only used for a small portion of donations (those not from banners).
Lua might help improve code maintainability, and slightly improve performance (?) but realistically I'd have to say this is a low priority.
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I've rewritten a few of the trickier templates to use Lua now. It does make the code much clearer, will probably do some more later.