findText() within itemByRange(): strange behavior

Hi,

I'm a little bit stuck with this:

var myScope = myDoc.selection[0].parentStory.characters.itemByRange(start,end); // at this stage, start is first character of Story and end is last one

var myFoundCharas = myScope.findText(); // find some text

alert(myScope.constructor.name); // gives "character", ok

alert(myFoundCharas.constructor.name); // gives "array" made of a mix of "word" "character" "textStyleRange"..., ok

alert(myFoundCharas[0].constructor.name); // gives "array" made of a mix of "word" "character" "textStyleRange"... ?!!!!? why not just "word"

alert(myFoundCharas[0][0].constructor.name); // gives "word"

If I change myScope to be the entire Story it gives the normal behavior:

var myScope = myDoc.selection[0].parentStory; // no more itemByRange

var myFoundCharas = myScope.findText(); // find some text

alert(myScope.constructor.name); // gives "story", ok

alert(myFoundCharas.constructor.name); // gives "array" made of a mix of "word" "character" "textStyleRange"..., ok

alert(myFoundCharas[0].constructor.name); // gives "word", ok

Any idea to explain this would be welcome?

Thanks