Storing a float into an array converts it to a string

I am parsing a json data from twitter. Since the geo data from twitter is a string, I use parseFloat to convert it to a float but when I store it to an array it converts it to a string. Is this a bug?

var tableData=[]; for(var i=0;i<reply.statuses.length;i++){

    tableData.push({
        latitude: parseFloat(reply.statuses[i].geo.coordinates[0]),
        longitude: parseFloat(reply.statuses[i].geo.coordinates[1]),
        image: reply.statuses[i].user.profile_image_url,
        title: reply.statuses[i].user.name,
        subtitle: reply.statuses[i].text,
        id: reply.statuses[i].id_str
        });
}
            Ti.API.info(JSON.stringify(reply));
            Ti.API.info(tableData);