> To handle this in code written around current __toString seems pretty

Yes it is, but that's not what we're talking about:
BC is about having perfectly fine code working in e.g. 7.0 be still working
fine on 7.1 *without any change*.

Right now, we have red test suites on php7.1rc2.
This is the symptom of a BC break, by definition.
And the issue is not the existing code we have, but the new one that is
changing the behavior of the engine.

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