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Lua 5.1.4 ltable.h contains this:

  #define gkey(n)       (&(n)->i_key.nk)
  #define key2tval(n)  (&(n)->i_key.tvk)

Lua 5.2.0-work3 makes them identical:

  #define gkey(n)      (&(n)->i_key.tvk)
  #define key2tval(n) (&(n)->i_key.tvk)

nk (anonymous struct) and tvk (TValue) differ only in type because
they are members of the same union.  Any reason not to eliminate
key2tval(n) ?

(FYI, here's a description of this area of code: .)