Error dumping file: cannot use complex value in dotenv file

Short version: I'm unable to use sops exec-env where a value in the JSON file is a list. I didn't see any indication in the documentation that this is a known limitation.

SOPS version

$ sops --version
sops 3.7.3 (latest)

Plaintext JSON

{
 "list_of_numbers": [42, 42, 42, 42, 42, 42, 13, 7],
 "pi": 3.1416,
 "py": "thon",
 "pie": "apple",
 "poe": ["edgar", "allan"]
}

I created a .sops.yaml so that the file is encrypted using my preferred KMS

SOPS doesn't complain or warn me while encrypting the file

$ sops -e test_data.json > test_data.sops.json ; echo $?
0

exec-file works

$ sops exec-file test_data.sops.json './sops_test_exec.py {}'
{'pi': 3.1416,
 'pie': 'apple',
 'poe': ['edgar', 'allan'],
 'py': 'thon',
 'list_of_numbers': [42, 42, 42, 42, 42, 42, 13, 7]}

exec-env does not work

$ sops exec-env test_data.sops.json './sops_test_exec.py {}'
Error dumping file: cannot use complex value in dotenv file: [%!s(float64=42) %!s(float64=42) %!s(float64=42) %!s(float64=42) %!s(float64=42) %!s(float64=42) %!s(float64=13) %!s(float64=7)]

sops_test_exec.py and sops_test_env.py are just trivial demo programs that load the decrypted secret values from the {} file or from the environment.

Start with the sops exec-env and exec-file commands, comparing their handling of the provided test_data.sops.json example. Use sops_test_exec.py and sops_test_env.py to reproduce the difference; done should mean either list values work through exec-env or the limitation is explicitly documented and covered by a regression test.