Required Ligatures (rlig) are not implemented for latin script.

[ILOVEPIE]

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Expected Behavior

rlig stands for required ligature, liga is optional ligature

Current Behavior

rlig is only on for arabic script.

Possible Solution

Add rlig to all scripts or just hard-code it to be on by default.

Steps to Reproduce (for bugs)

see #479 for reproduction steps.

Context

Some fonts use rlig instead of liga because they don't want the ligatures to be toggleable.

[Connum]

I wouldn't hardcode it or make it un-disableable (is that an actual word?). An application like a font editor might want to disable them temporarily for debugging or demonstration purposes. I would just turn them on by default.

[ILOVEPIE]

At the very least we should handle rlig for latin text.