Right now we have things like mw.Title.newFromText( template ); , while really that should use something like mw.Title.newFromText( template, 10 ); or whatever. This is probably fine in practice, but theoretically matters is NS_MAIN and NS_TEMPLATE have different capitalization settings.
We also currently render the titles of {{foo}} (which points to Template:Foo, renders as Foo) and {{:foo}} (which points to Foo, also renders as Foo) the same, we should fix that.
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Severity: normal