alias RuleNodeSubtype

---

(alias) RuleNodeSubtype = (0|1|2|3|4|5|6|7|8|9)
    | 0 -- normal
    | 1 -- box
    | 2 -- image
    | 3 -- empty
    | 4 -- user
    | 5 -- over
    | 6 -- under
    | 7 -- fraction
    | 8 -- radical
    | 9 -- outline

Reference:

• Corresponding C source code: texnodes.c#L602-L611

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