dist/webdb.umd.js
function indexOf(list, element, comparator) {
			for (var i=0,item; item=list[i]; i++) {
				if (equals(item, element, comparator)) {
					return i;
				}
			}
			return -1;
		}
function indexOf(list, element, comparator) {
			for (var i=0,item; item=list[i]; i++) {
				if (equals(item, element, comparator)) {
					return i;
				}
			}
			return -1;
		}
function indexOf ( list , element , comparator ) { for ( var i = 0 , item ; item = list [ i ] ; i ++ ) { if ( equals ( item , element , comparator ) ) { return i ; } } return - 1 ; }
returns index of given element in given list, using given comparator
returns index of given element in given list using given comparator