What is the difference between the intended uses of those existing options
and the intended uses of the new options, given that -Wno-dev is mostly
useful for third parties to silence policy warnings?

Working on this issue, I did find the different variables/options a bit 
confusing. dev and deprecated both change the effect of message modes, pretty 
much doing the same thing but slightly different (for example there is -Wdev 
and -Wno-dev, but not -Werror=dev or -Wno-error=dev). Would it be worth 
refactoring the -W dev options to be in line with the -W deprecated options?

If the new options are merged to master should -Wdev and -Wno-dev also be
changed to affect CMAKE_WARN_DEPRECATED?

That would be sensible behaviour to me, shall I modify cmake::Configure to do 
this?

Cheers,
Michael

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