How to turn off calt?

[jabbalaci]

In the README it's written that if we don't need ligatures, we need to turn off calt. What is this calt and how to turn it off? I'm under Linux.

To disable ligatures, I installed the package ttf-iosevka-fixed, which solved the problem. But with ttf-iosevka-nerd, ligatures are on by default. I'd like to know how to turn off ligatures for ttf-iosevka-nerd too. Thanks.

[be5invis]

It is a per-software configuration. In webfont CSS you apply:

selector {
    font-feature-settings: "calt" 0;
}

[bennyyip]

How can I disable ligation by editing ttf files? It takes time to run a custom build.