That technique is beautiful! And the results are as good as I would expect, once you’ve given the compiler the information it needs to do a good job. I’ll keep

That technique is beautiful! And the results are as good as I would expect, once you’ve given the compiler the information it needs to do a good job. I’ll keep this one in mind next time I need to clearly delineate the fast path from the fallback path and I’m using something with access to the musttail attribute.