Readability of Thai language in LaTeX

[“Plane” Abhabongse Janthong]

Discuss topics such as

1. Leading, also known as “line height”.
2. Horizontal spaces, e.g., how much space should you put preceding U+0E46 (ๆ), after each sentence, after each item in enumeration, etc.
3. Other stuff (of which I could not think yet)