Hi!
it should actually be a hard error. As we always claim PHP follows pure IS-A relation ships.
I feel very uneasy with hard errors on something that is not indeed an error preventing engine from continuing. I.e. my (personal) opinion is that if the engine can move forward, even with some assumption, it should. IMHO it's like having undefined variables, etc. It makes PHP less strict, but I'd say it's not necessarily a bad thing.
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