RouterService urlFor queryParams not serialized if is array of objects

Imagine filters is an array of objects:

`[
{
key: "foo",
value: bar"
},
{
key: "qux",
value: bar"
}
]`

Link to will generate a valid JSON.stringified URI.
`
{{#link-to "index" (query-params filters=filters)}}hallo{{/link-to}}`
[/?filters=%5B%7B"key"%3A"foor"%2C"operator"%3A"%3D%3D"%2C"value"%3A"bar"%7D%2C%7B"key"%3A"qux"%2C"operator"%3A"%3D%3D"%2C"value"%3A"bar"%7D%5D](url)

The RouterService urlFor function, will last us with an [object Object] URI
`this.urlFor('index', {queryParams: {filters: this.Filters}})`
[/?filters[]=%5Bobject%20Object%5D&filters[]=%5Bobject%20Object%5D](url)