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Vim’s package manager doesn’t really support version constraints, as it’s mostly used with git submodules.
One way to fix that would be plugin repositories with branches like 1.x or 1.1.x, and have users `git submodule add --branch 1.x` to not break their setups. 🤔
It might be overkill for a color scheme, but I’m trying this for Dim. The recommended way to install Dim is cloning the `1.x` branch:
git clone --branch 1.x git@github.com:jeffkreeftmeijer/vim-dim.git ~/.vim/pack/plugins/start/vim-dim
Server run by the main developers of the project 
It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!
On the off chance that this is an original idea, I’d like to coin “pessimistic versioning branches”.