I am using version 1.1.0.
Problem:
Function xhrPost is makeing an urlencoding of the content before sending it.

Example:
dojo.xhrPost({
url: "/portal/trlService",
handleAs: "xml",
headers:{"SOAPAction":""},
content:{"mytest":"<"},
contentType: "text/xml;charset=iso-8859-1" });
};

Output from the browser:

POST /portal/trlService HTTP/1.1
Accept: */*
Accept-Language: en-US,sv;q=0.5