I think that it will be fairly common (e. g. everyone using lsp-mode)
will have to use that setting. I am afraid that even if I choose option 1
the distributions like spacemacs/doom will set it globally(because they
are allowed to be opinionated).

When you create a process you provide a bunch of settings(e. g. 
:connection-type, :filter, :no-query). Can we make another property for 
the read max size? 

Thanks,
Ivan

On Sat, Dec 21, 2019 at 8:25 PM Eli Zaretskii <eliz@gnu.org> wrote:
> > 1. Document it in lsp-mode's readme
> > 2. Override it with a setting in lsp-mode with a bigger value.
> >
> > Both have clear advantages and disadvantages. Can you advise?
>
> I'd suggest the former, because if lsp-mode sets the value, it will
> affect the entire Emacs session.
>
> If lsp-mode uses accept-process-output, it could bind the variable
> inside the form which calls accept-process-output.

Btw, my assumption was that the value will have to be changed from
default only in very rare situations.  If this is not the case, we
might indeed want that to be a parameter at process creation time (I
don't think we have process-local variables, do we?).