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Moving the goalposts, I can see.

Of course, merging different backends can not be done on the backend. Either you add a layer or you do it on the client.

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That seems to be an odd way of looking at it, IMO. Most of the time, the entire point of building an API is to present consistent functionality to any consumer, not only ones under your control. Also, a well-behaved API is versioned so as to allow evolution of the API without breaking existing clients who can upgrade to new versions as they are able.

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