Deprecate changing the status code of a response after it has been prepared #1480
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Changing the status of a Response after it has been prepared doesn't do anything and should raise an exception imo.
Since breaking all apps that do this might not be an option, I've added a warning when this happens and I would suggest changing the warning to an exception in the next major release (not sure what the policy on breaking changes is, so up to you!)
(this PR is missing updates in CHANGES/…, I can add those if this looks good to you)