[Python-ideas] Re: Add a slot for "keys" in tp_as_mapping

Serhiy Storchaka wrote:

PyDict_Merge() is called every time when you have a call like `f(a=1, **kw)`

So would not be worth to add slots for keys (and maybe for values and items) to the tp_as_mapping structure?

Only if looking up those methods is taking a substantial proportion of time. Measurements will be needed to find out.