"Aug 32, 2018" became valid in lenient datebox after ZK-4023

Steps to Reproduce

<zk>
    <datebox format="MMM d yyyy" lenient="true"/>
</zk>

Input "Aug 32 2018"

Current Result

Accepted and parsed as "Sep 1 2018"

Expected Result

An error message should be popped.

Debug Information

Adding strictDate option shouldn't affect the lenient spec.

https://github.com/zkoss/zk/blob/v8.5.2.1/zul/src/archive/web/js/zul/db/datefmt.js#L325
Only 0 - 31 is valid.

Jan 0 2018 => Dec 31 2018
Feb 30 2018 => Mar 2 2018

Workaround