Neovim 0.8.0 with 34 plugins via packer. In a config file I have set epandtab = true. But a large majority of files opened for editing have noexpandtab set. This issue seems to be independent of filetype; e.g., of a couple dozen .lua files tested, only 3 had an expandtab result for :set et? and the rest a noexpandtab result. I used grep over all my config files and all the plugin repositories to find instances of expandtab and found many, but most were setting it to true and the rest were setting it to false in a non-applicable context.
I could write an autocmd to set it to true but I wonder what, if anything, that might break. What is a good way to find out what is the "culprit"?