text_composition_strategy for "properly" black text in kitty

[0cjs]

I use Debian 12 with the fvwm2 window manager, and no compositor. In my kitty configuration I use foreground #000000 and background lightyellow (just as I do in urxvt and xterm) to get very black text on very light (but not straight white) background. This looks about right in kitty 0.26.5 (what's currently being distributed with Debian). But in the latest release I just downloaded, 0.42.2, the text comes out in a medium grey, rather than black.

Setting text_composition_strategy legacy seems to "fix" this, in that it reproduces the old behaviour, but I sort of gather from the comments in the new config file that the old strategy had problems and this isn't the right way to go about this. Still, it strikes me as odd that asking for black would produce grey characters. Should I just be using legacy, or are there some settings for the gamma and multiplicative contrast (which I don't really understand) I should be using instead?