skip if value type incompatible

Author: Tao Wen

iter_array.go

@@ -9,8 +9,7 @@ func (iter *Iterator) ReadArrayHead() bool {
 			return false
 		}
 		iter.ReportError("ReadArrayHead", "expect [, but found "+string([]byte{c}))
-		iter.unreadByte()
-		iter.Skip()
+		iter.skip(c)
 		return false
 	}
 	c = iter.nextToken()

iter_bool.go

@@ -4,21 +4,23 @@ package jsoniter
 func (iter *Iterator) ReadBool(out *bool) error {
 	c := iter.nextToken()
 	if c == 't' {
-		err := iter.skipThreeBytes('r', 'u', 'e')
+		err := iter.skipThreeBytes('r', 'u', 'e') // true
 		if err == nil {
 			*out = true
 		}
 		return err
 	}
 	if c == 'f' {
-		err := iter.skipFourBytes('a', 'l', 's', 'e')
+		err := iter.skipFourBytes('a', 'l', 's', 'e') // false
 		if err == nil {
 			*out = false
 		}
 		return err
 	}
+	if c == 'n' {
+		return iter.skipThreeBytes('u', 'l', 'l') // null
+	}
 	err := iter.ReportError("ReadBool", "expect t or f, but found "+string([]byte{c}))
-	iter.unreadByte()
-	iter.Skip()
+	iter.skip(c)
 	return err
 }