The `configure` option is not type checked and an artifact of how
nixpkgs is implemented.
We now have the equivalent options in home-manager and managing
interactions between the 2 systems complexifies maintainance of the
module.
Please use the other options at your disposal:
configure.packages.*.opt -> programs.neovim.plugins = [ { plugin = ...; optional = true; }]
configure.packages.*.start -> programs.neovim.plugins = [ { plugin = ...; }]
configure.customRC -> programs.neovim.extraConfig
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