WhereOr返回的过滤条件为什么是AND

WhereOr过滤条件大家都不使用吗？如下：
`
$where[] = ['mobile', 'like', 'thinkphp%'];
$whereOr[] = ['name', 'like', '%thinkphp'];
Db::name("abstract_logic_testing")->where($where)->whereOr($whereOr)->select();

$actual = Db::name("abstract_logic_testing")->getLastSql();
`

这段代码$actual的结果，不应该是SELECT * FROM m_abstract_logic_testing WHERE ( mobile LIKE 'thinkphp%' ) OR ( name LIKE '%thinkphp' )吗？为什么结果是 SELECT * FROM m_abstract_logic_testing WHERE ( mobile LIKE 'thinkphp%' ) AND ( name LIKE '%thinkphp' )。

这个问题从版本3.0.31就出现了（3.0.30运行这段代码符合预期：是用OR链接的两个条件），到现在4.x版本了都是错的（是用AND连接的两个条件）。

Start with the chained where() and whereOr() calls shown in the issue and inspect how getLastSql() builds the condition. Compare the behavior in version 3.0.30 with 3.0.31 and 4.x. Done means the example combines the mobile and name conditions with OR as expected.