Strange behavior with strings that are submitted via a form

Hi list,

twoday I expirienced a strange problem with simple input fields. My form:

{{{
<form method="get" action="">
Name: <input type="text" name="einname" /><br />
Nummer: <input type="text" name="nummer" /><br />

<input type="submit" name="submit" value="Go" />
</form>
}}}

Normaly I check if we have a multi select: with the following code in helma:

{{{
for (var i in req.data) {
    res.debug("Formfield: " + i);
    res.debug("data[i+_array]: " + data[i + "_array"]);
    res.debug("data[i]: " + data[i]);
    if (req.data[i + "_array"]) {
       // do something with multiselect
    } else {
       // do something with normal text
    }

}
}}}

Intresting thing after debuging is that the submited req.data.einname 
has a equivalent req.data.einname_array!

Output from res debug:
{{{
Formfield: einname
data[i+_array]: [Ljava.lang.String;@41e525
data[i]: philipp
}}}

Can somebody tell me if this is a bug and if not, how to test for 
multiselects "the new way" ;)

cu Philipp