Fix bytecode bool conversion and object equality

lynglib/stdlib/lyng/root.lyng

@@ -65,11 +65,7 @@ fun Iterable.filterNotNull(): List {
 /* Skip the first N elements of this iterable. */
 fun Iterable.drop(n) {
     var cnt = 0
-    val result = []
-    for( item in this ) {
-        if( cnt++ >= n ) result.add(item)
-    }
-    result
+    filter { cnt++ >= n }
 }
 
 /* Return the first element or throw if the iterable is empty. */