[$] CPython without a global interpreter lock

The global interpreter lock (GIL) has been a part of CPython since thebeginning-nearly-butthat seems likely to change over the next five or so years. As we described last week, thePython steering council has announcedits intention to start moving toward a no-GILCPython, potentially as soon as Python3.13 in October2024for the preliminaries. The no-GIL version of CPython comes from SamGross, who introducedit as a proof-of-concept nearly two yearsago; now, the idea has been formalized in a Python Enhancement Proposal(PEP) that describes no-GIL mode and how it interacts with the rest of thePython ecosystem.