Empty array become null in json output after with_entries(select(...))

[linyinfeng]

Describe the bug

Version of yq: 4.40.2
Operating system: linux
Installed via: binary release

Input Yaml
Concise yaml document(s) (as simple as possible to show the bug, please keep it to 10 lines or less)
data.yml:

a: []

Command
The command you ran:

yq eval 'with_entries(select(.key == "a"))' data.yaml --output-format json

Actual behavior

{
  "a": null
}

Expected behavior

{
  "a": []
}

[mikefarah]

Hey thanks for raising! That's a nasty bug - will make a new release shortly.

[mikefarah]

Fixed in 4.40.3