Topic: problem with JSON parameter in request funtion

sorry maybe it was discused but i didn't found

i have function

xajax_showAppWizard({"app_id":null,"d_t_start":"2012-08-03 13:30:00","d_t_end":"2012-08-03 14:00:00","ag_id":22944});

with json parameter

for version 0.2.x xajax request:

xajaxargs[]    <xjxobj><e><k>app_id</k><v>null</v></e><e><k>d_t_start</k><v>2012-08-03 09:00:00</v></e><e><k>d_t_end</k><v>2012-08-03 09:30:00</v></e><e><k>ag_id</k><v>522</v></e></xjxobj>

app_id=null

for version 0.5 xajax request:

xjxargs[]    <xjxobj><e><k>app_id</k><v><xjxobj></xjxobj></v></e><e><k>d_t_start</k><v>S<![CDATA[2012-08-03 13:30:00]]></v></e><e><k>d_t_end</k><v>S<![CDATA[2012-08-03 14:00:00]]></v></e><e><k>ag_id</k><v>N22944</v></e></xjxobj>

app_id=object and on server site it will be empty array

what the problem?

for beta 0.6
it is again right null. only 0.5 version incorect request