The functions make-process and make-network-process have many keyword
arguments and it's somewhat easy to misspell some of them.  E.g. using
:coding-system instead of :coding.  These functions don't detect such
mistakes at runtime.  What would people think about adding some checks
as a compiler macro as with the patch below?

I didn't know where to put this, so I just left it in bytecomp.el.

Perhaps the advertised-calling-convention declaration could do this, but
since keyword arguments seem to be generally discouraged, a special case
for make-process and make-network-process maybe simpler.

Helmut