String indexing again

[Dirk Laurie <dpl@...>]

>From the Reference Manual, description of the function string.byte:

[[
    Returns the internal numerical codes of the characters 
    s[i], s[i+1], ···, s[j]
]]

What better proof do we need that s[i] means the character 
corresponding to the i-th byte of the string s?  If not (yet)
in the Lua language, then at least in the terminology used by
the author of the reference manual?

Dirk