It would be helpful in these guidelines to make a clear distinction between changes that result in "code not compiling" versus "code behaving differently". It

It would be helpful in these guidelines to make a clear distinction between changes that result in "code not compiling" versus "code behaving differently". It seems like the vast majority of cases you've enumerated are in the category of "code won't compile". Perhaps some have a knee-jerk reaction against this, but to me this is kind of incompatibility seems much more preferable to the other, especially if the update required to the code is trivial and obvious.