ghcup does not have GHC 7.8 nor lower

Did cabal install ghcup to get easy access to ghc versions, but then 7.8.4 is not supported, neither 7.6.3 etc. The docs do not inform me which versions it supports (at least not prominently; I expected to find the information around here: https://www.haskell.org/ghcup/install/#supported-tools). I can get it via ghcup list, but only after installing the tool...

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