Currently there is no policy on what should be done when an immediate,
severe breakage happens for "important/often used parts", which can cause
serious concerns especially if such changes remain obscured.
This adds a provision for this kind of incompatible changes under
"extraordinary circumstances", which allows for the breaking change to happen
if there is a critical reason to do so. Such changes must be extensively
documented, and should be avoided as much as possible.
nanahi
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