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<@U0DGYKCFQ> The reasoning behind the copy during extension is explained in the third comment of this issue : <https://github.com/SalomonBrys/Kodein/issues/100>

Wow, it is serious. Thanks for explanation. Happy to see I am able to safely use `copyAll = true` in the tests

When I think about it, only `singleton` and `multiton` bindings should be "protected". Other bindings such as `provider` or `factory` could safely be systematically copied. I may add that into beta 4. I think that would make this all concept more bearable :wink:. I'll think about it.

My situation quite complex. I have singleton DB connection scoped per request. I can’t allow two requests share one transaction. However, inside tests I doesn’t have request scope, so I am using simple singleton.