[luatex] node.vpack question

[Robert Krug]

Greetings,



I may be missing something fundamental, but I find this behaviour surprising:



This will cause an error:



node.vpack(node.new("glyph"))

! This can't happen (vpack).


This will not:



node.hpack(node.new("glyph"))


Is this intended?  I had thought of vpack and hpack as analogous operations, just differing in how they stacked items.



I am using LuaTeX as shipped with TeXLive 2020.



Thanks,

Robert


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