Inconsistency with the manual

["Soni L." <fakedme@...>]

The manual states:

%f[set], a frontier pattern; such item matches an empty string at any 
position such that the next character belongs to set and the previous 
character does not belong to set. The set set is interpreted as 
previously described. The beginning and the end of the subject are 
handled as if they were the character '\0'.

A pattern is a sequence of pattern items. A caret '^' at the beginning 
of a pattern anchors the match at the beginning of the subject string.

However, I noticed something kinda weird:

string.match("''", "%f[']'", 2) --> nil
string.match("''", "^'", 2) --> '

You'd think the first ' in the first string.match would be handled as 
the character '\0', consistent with '^'. Or, you'd think the latter 
would never match.

So uh, '^' -> runs the match only once, at the specified position?

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