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** Adding a foreign key or unique key.
 
** Adding a foreign key or unique key.
 
** Adding new features, even isolated components or scripts.
 
** Adding new features, even isolated components or scripts.
 +
** Code or performance optimizing
 
* There is an exception: We can add backported code of version x.y+1 into a maintenance branch to prepare transition for developers of external modules, but only if code added is a complete new method or new function, with no other change.
 
* There is an exception: We can add backported code of version x.y+1 into a maintenance branch to prepare transition for developers of external modules, but only if code added is a complete new method or new function, with no other change.