Mono font has arrow ligatures that are one character wide

[charredUtensil]

This is similar to #89, but much worse:

https://fonts.google.com/specimen/Overpass+Mono?query=overpass&preview.text=123-%3E456%3C-789&preview.text_type=custom

The characters -> and <- are being replaced with an arrow, but this arrow character is only a single character wide in the monospace variant. This is very wrong. I use Overpass Mono as a terminal font and, unlike the /f(f?[il]|f)/ ligatures which only seem to cause problems in web content, this does happen in my terminal and messes things up completely. I assume it's using different triggering logic.

A monospace font should never have ligatures that change the width of text.

All ligatures in the monospace font should be altered to be as wide as the number of characters that constitute them.