[luatex] Command to write directly from Lua to the aux file?

[Faheem Mitha]

Hi,

I was thinking it would be convenient to have a convenience function for 
writing to the aux file from Lua. See for example

https://tex.stackexchange.com/questions/337469/write-to-aux-file-directly-from-lua

A manual approach is possible, as described by the answer in that thread, 
of course.

Regards, Faheem Mitha