From: Sascha Abel <sascha.abel@...>
Date: 2010-03-01T19:19:18+09:00
Subject: Re: Strings - foovs..  foo[-1,0] ?

string[i,1] gives you the char at index i,

string[i,0] gives you not the char but some kind of a marker just 
*before* that char.

So string[i,1]= 'X' overwrites that char, while

string[i,0] = 'X' inserts before it.

string[-1,1] gives you the last char of string, accordingly

string[-1,0] gives you that marker just *before* the last char.

You would have to do something like string[-0,0] to get *behind* the 
last char if you want to count from the end of the string, which is not 
possible so you have to count from the beginning: string[string.size,0]
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