vim-colors-github
                                
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                        force override any defaults
First of all thank you for the theme. ❤️
I noticed that some colors are not applied when you use hi link(the defaults are forced):

So I replaced all hi link with hi! link to force the usage of linked rules:

That’s what hi clear does, isn’t it? Not sure what went wrong for you.
@cormacrelf yes it should. But I have a problem with «SignColumn». It seems to not be affected by hi clear. It works however if I add another hi clear SignColumn. Weird.
@gko It should... and it does. Can you reproduce with every other vim setting at its default?
Yes I can: NVIM v0.3.4 Os: MacOS 10.14.5 Terminal: Both MacOs terminal and iTerm
~/.config/nvim/init.vim:
set number
set signcolumn=yes
color github
The only file in ~/.config/nvim/ folder:
colors/github.vim
Result:

vim 8.1.1150
~/.vimrc:
syntax on
set t_Co=256
set number
set signcolumn=yes
color github
Result:
