How to replace the value list of an array?

I want to replace the value list of an array with a new list of values. However, the two overlay implementations I've tried treat the following example as "append to an array" rather than "replace an array".

I'm not sure if the implementation behavior is correct or a bug, so wanted to confirm the intended behavior with the spec authors.

OpenAPI document:

openapi: 1.0.0
info:
  title: Array replacement test
  version: 1.0.0
paths: {}
x-foo:
  x-bar:  # I want to replace all values of this array
    - 1
    - 2

Overlay:

overlay: 1.0.0
info:
  title: Array replacement test
  version: 0.0.1
extends: array-test.yaml

actions:
  - target: $['x-foo']
    update:
      x-bar:
        - 3
        - 4

The Action Object section says:

When the Overlay document is applied, the properties in the merge object replace properties in the target object with the same name

I understand this as x-foo being the "merge object", x-bar being a "property in the merge object", so the x-bar value from the overlay should replace (and not be appended to) the x-bar value in the document.

The workaround is to remove the array node then re-add it with the new values. This seems a bit verbose, but if that's the intended way to replace arrays then I'm OK with it.

actions:
  - target: $['x-foo']['x-bar']
    remove: true

  - target: $['x-foo']
    update:
      x-bar:
        - 3
        - 4

Start with the Action Object section of the Overlay Specification and compare its merge wording with the provided OpenAPI and Overlay YAML examples. Confirm whether updating x-bar should replace or append the array, and document the intended behavior or the remove-and-readd workaround in the specification.