As i understand this idea is another way around key word "volatile" in order to allow compiler perform more optimization.
Then why to go half way introducing "safe", when it's better introduce "volatile". Not too long ago here was discussion about it, but it was strongly rejected by core team.

I do not support idea of "safe", as it's partial solution to more complex problem. It's better to introduce "volatile" together with data flow analysis.
 
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