queryParams array attribute becomes a string if other attribute changes before model is resolved

See this twiddle please.

There are two queryParams:

• categories array
• searchQuery string

The model resolves the current time with a 1-second timeout.

Steps:

1. Open the console and see the current value of categories.
2. Add at least one category by hitting the “Add category” button (do not enter anything into the text input on this stage).
3. Observe categories is still an array in the console.
4. Enter any text into the input field.
5. If the searchQuery is modified before the transition completes, the categories becomes a string. From this point, it becomes even worse with every modification because it escapes escape symbols on every iteration.

[sly7-7]

@rwjblue I’ve reproduced your twiddle in https://github.com/sly7-7/ember-repro-15611 (ember 3.25.1), and it looks like this is fixed. So I guess this could be closed, and #19145 maybe not necessary

[rwjblue]

Thanks @sly7-7!