[REPRODUCTION] Multiple QP serialization...
[REPRODUCTION] Multiple QP serialization...

...on activeTransition in `_doTransition`.
`_processActiveTransitionQueryParams` returns serialized values and we serialize them again in `_prepareQueryParams`, which expects deserialized values.

Refs: #14174

elwayman02/ember.js,elwayman02/ember.js,mixonic/ember.js,mixonic/ember.js,emberjs/ember.js,tildeio/ember.js,emberjs/ember.js,tildeio/ember.js,mixonic/ember.js,stefanpenner/ember.js,sly7-7/ember.js,sandstrom/ember.js,tildeio/ember.js,sandstrom/ember.js,stefanpenner/ember.js,emberjs/ember.js,sly7-7/ember.js,knownasilya/ember.js,sandstrom/ember.js,knownasilya/ember.js,sly7-7/ember.js,elwayman02/ember.js,elwayman02/ember.js,stefanpenner/ember.js,knownasilya/ember.js