read / write
Returns the starting position of the current rune in the string.
Returns null if the current
rune is null.
/
/** Resets the iterator to the rune at the specified index of the string.
Setting a negative rawIndex
, or one greater than or equal to
string.length
,
is an error. So is setting it in the middle of a surrogate pair.
Setting the position to the end of then string will set current
to null.