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Hi all,In Lua 5.1.4 source,the Tkey union definition is:
323 typedef union TKey {
324   struct {
325     TValuefields;
326     struct Node *next;  /* for chaining */
327   } nk;
328   TValue tvk;
329 } TKey;

and the TValue definition is:
 73 typedef struct lua_TValue {
 74   TValuefields;
 75 } TValue;

so my question is, why just define TKey union like this:
typedef struct TKey {
   TValue tvk;
    struct Node *next;
} Tkey;

?