json-enc fails with complex json

[florian-sun]

If I set hx-vals to a JSON object containing an array, and the array is populated with more than one item, like this

<button hx-ext="json-enc" hx-vals='{"Id":1,"Items":["abc","xyz"]}'> ...</button>

I get an error when I do a POST request:

TypeError: Converting circular structure to JSON
--> starting at object with constructor 'Array'
--- index 2 closes the circle
at JSON.stringify ()
at Object.encodeParameters (json-enc.js:32:20)
...