There is literature, and it is nuanced. Some of the stuff from the 1930s lays it out that if you can get a little knot of similarly gifted children they are very good at socializing-where the problems come are when you take Johnny who remembers wrongs because he's ahead in development and set him with others that aren't ready for rule based/turn taking; compound that with adults that can't see why things are going pear shaped...

They do talk about the problems of the profoundly gifted when they have no peers. Humans are social, but they need to be meeting somewhere even and safe. If you think age-grouping is the only way to go... A little gifted child has got enough on plate not to have to worry about seeming different and thus 'alien'. It's usually better there be some older kids in the pack that can smooth out the ways kids aren't on the same page.