This commit adds as it can, comfort to some developers.
Returns a reference to $this on add* and set* methods on \Doctrine\OR…
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I personally don't see that much of use on the fluent interface... Maybe acceptable on a configuration object though.
Also, this one would require to change the other config objects across doctrine project for consistency.
A fluent interface has no benefit here.
Edit: We don't add fluent interfaces everywhere were multiple calls to one object happen, only when it makes sense in termes of creating a DSL of method calls.