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7d4b788381
The `ErrAlreadyExists` error is used for 304 statuses, which is not an error-condition, so should probably not be defined as part of the errdefs package. This patch removes the `ErrAlreadyExists` interface, and related helpers, as it was currently not used. Note that a 304 status can fulfil certain use-cases, but (refering to https://www.codetinkerer.com/2015/12/04/choosing-an-http-status-code.html) could probably be handled by a 200 OK, unless we want to perform caching in the client. If we do want to use 304 statuses, perhaps we need a separate class of "errors" for this (?). Signed-off-by: Sebastiaan van Stijn <github@gone.nl>