Remove Ligatures and Hyphenation in the active document

Hi,

I wonder if it's possible to remove ligatures and hyphenation attribute in the whole active document (including all the layers)?

I've started with this:

var doc = app.activeDocument;
for (var i = doc.pageItems.length -1; i > -1; i--) {
    var item=doc.pageItems;
    if (item.typename == "TextFrame") {
            changeText(item)
        }
 }
function changeText(item) {
    item.textRange.characterAttributes.ligature.false
    }