according to soap structure for SendMsgResponse the response should be,
<SendMsgResponse> ## SendMsgResponse
<m [id="..."] /> ## Id
but what i am getting in JSON response is,something like this.
note that [ and ]. there should be no squre braces in m tag. this is same issue like strange JSON response for AuthRequest.. i request moderators as well as active developer to check this issue and raise a bug if it is a bug.