^ this.
A whole lot of stuff just depends on dev-lang/ruby. In my install this is dev-texlive/texlive-pictures-2011 and media-gfx/graphviz-2.26.3-r3. Thus, when >=ruby-1.9 is unmasked, the highest slot is pulled in by these packages.
I have no idea about the differences between ruby versions, so I can't say how large the breakage from this will be. However, until something I want to use depends on ruby:1.9 it'll stay in my packages.mask.
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