TrickyDicky
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Interestingly though, all of the advice is still to include only numeric_std even though numeric_std_unsigned also exists and is now an official standard.
Unless things have changed recently, Neither Quartus nor Vivado include this library! Their 2008 support is still rather selective. Go mad with simulation tools though - they have had them for years!
Quartus Pro 16+ does have good 2008 support, so probably does include it.