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MariaDB 10.0.14 got rid of replication safety warning without warning in release notes?



I see that in MariaDB 10.0.14 Michael disabled replication safety
warning for the case of INSERT ON DUPLICATE KEY UPDATE with several
unique keys with a comment "We should assume that the store engine
will report the first duplicate key for this case."
What does that mean? Which key is "the first duplicate key" and why
MariaDB relies on an engine behavior which AFAIK is not guaranteed?
And why this serious change in behavior wasn't mentioned in the
Release Notes?

On the related note Release Notes mention the error log flood
protection. Why it's not behind flag? How should I disable the feature
and get back to the old behavior?

Thank you,

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