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On 30/09/2016 22:52, Shmuel Zeigerman wrote:
On 30/09/2016 21:52, Egor Skriptunoff wrote:
"s:sub(k,0)" and "s:sub(0,k)" are always empty strings for any s and k
Zero index always "kills" the substring.

This statement is not correct.

E:\home>lua53 -eprint(('abcd'):sub(0,2))

I should have read the message in the context. Sorry for the noise.