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> Lua 5.1.4  Copyright (C) 1994-2008, PUC-Rio
>> =("12345"):sub(1,0)
   The reference manual says (pg. 74 /
"Indices are allowed to be negative and are interpreted as indexing
backwards, from the end of the string. Thus, the last character is at
position -1, and so on." To me, that means sub(1, 0) should return the
string between the first character and the last character, i.e., the
empty string.