lastchange sort doesn't work with trigger.get method

lastchange sort doesn't work with trigger.get method. There are no difference with "ASC" and "DESC" on sortorder parameter.

• trigger.get with parameter "sortfield":"lastchange" and "sortorder:ASC"

{"jsonrpc":"2.0","result":[

{"triggerid":"22328","state":"0","lastchange":"1389679853","value_flag":"0"}

,

{"triggerid":"20354","state":"0","lastchange":"1389679853","value_flag":"0"}

],"id":1}

• trigger.get with parameter "sortfield":"lastchange" and "sortorder:DESC"

{"jsonrpc":"2.0","result":[

{"triggerid":"22328","state":"0","lastchange":"1389679853","value_flag":"0"}

,

{"triggerid":"20354","state":"0","lastchange":"1389679853","value_flag":"0"}

],"id":1}