Shall we have a "close stdin" function?
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For some programs, no output will be given until its stdin is closed. One example is fzf when it is being used as a filter to find matches in what's provided from stdin. I was using fzf to write a preprocessor for asyncomplete.vim, and having no "close stdin" function makes it hard to use async.vim to make the code compatible with both vim and nvim.
My current solution is adding a close_stdin function as what's done here. This solution is kinda awkward, as it doesn't follow the "interface similar to nvim" as other functions in this project. Also, at this point I don't think it is possible to create an interface which is compatible with vim that does everything nvim's interface does: nvim's chanclose can close stdin, stdout or stderr, while vim only provides ch_close which closes all channels and ch_close_in which closes stdin.
Ops. Just noticed the pending PR (#34) is also about this.
Closing since #34 is merged.