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I haven't reviewed the patch, but if the intent is that the user can change the global, then it should not start with an _, and it should be a documented part of the API. If you want to suggest that users should not normally change it, then you can do that in the docs. 
If you give something an _, then it is not considered part of the public API and it (the internal API, not the value) is subject to change, which means you should *not* suggest that users change it. If they find it and want to change it anyway, that's their lookout. That's the consenting adults part :)