Also, I'd mention to those who think that violet/magenta aren't "real" colors that the red X decays more slowly than the blue Z at short wavelengths so you can get saturated violet/magenta single wavelength colors (not well represented on the standard chroma charts) below 400nm at high power. Of course they aren't efficient for monitors (even blue isn't) and they're dangerous to look at for any length of time. But if you see a (single wavelength) violet/magenta laser, it's time to look away or shut your eyes.
I wanted to start from the very beginning and as far as I know Lab and OKLab didn't come later. Studying the 1931 studies and such was a start, and I wanted to later bring up all the other things we've learned since then, but haven't had time to write more about it
It's hard to tell how exact a particular shade of yellow is, but if you have several shades the correct one stands out immediately.