I've finished the draft for adding formatter for fpos (This thread https://lists.isocpp.org/std-proposals/2024/07/10526.php in mailing list). See https://extra-creativity.github.io/public/cpp/proposals/add%20formatter%20for%20fpos.html for it and I appreciate any advice.

Great thanks to Victor Zverovich and Arthur O’Dwyer!

Liang Jiaming