List[Int] vs. Int discrepency in template

In the *.response.yaml files, the resp: parameter must be submitted as a list of ints, even if there is only a single answer.

Example: [1] vs. 1

Additionally, an answer of index 0 causes the problem to be graded as incorrect.

Example: 3.1.2.d.jqr

- choices:
  - stack
  - heap
  - both
  soln: [0]
  text: 'Does the stack or the heap automatically deallocate after the function returns?'
  type: MC

3.1.2.d.jqr.response.yaml

- choices:
  - stack
  - heap
  - both
  resp: [0]
  text: 'Does the stack or the heap automatically deallocate after the function returns?'
  type: MC

output

Question (MC): Does the stack or the heap automatically deallocate after the function returns?
	Your Response: [0]

This was tried with resp: and soln: being [0] and 0, for a total of four different attempts at finding the correct format.