The PEP needs to state more clearly up front (preferably in the title) that it's about *reserving* a Python level syntax that matches the syntax we worked out for Argument Clinic at PyCon US. Explicitly stating that the requirements that drive the Argument Clinic design are to support the signature of all current CPython builtins and extension modules would also be helpful.
Generally, it needs to be a bit clearer that the intent of the PEP isn't to say "let's do this", it's to be explicit that acceptance of the Argument Clinic PEP severely constrains the design space for possible solutions if we ever *did* implement Python level support for positional only arguments. A few other specific points: - parameters in optional groups should just have an implied "=None" that can be overriden if desired. - parsing positional only args in Python is actually pretty easy in most cases, as you can just use a second private function to do the heavy lifting. - a simpler variant that omits the grouping support and only allows optional parameters on the right should also be reserved - explicitly delegate to the argument clinic PEP for the impact on inspect.Signature Cheers, Nick.
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