Yaml encoding converting strings to decimals

[rickeyski]

Hi,

I have a project on LTS-21.25 (ghc 9.4.8, yaml 0.11.11.2) that is manipulating K8s manifests. We encountered an issue where attempting to decode and then re-encode the same yaml files creates errors because a string of ".1" is converted to a decimal of .1.

A minimal repoducer is

env:
- name: ACTIVE_API_CALLS_ALLOWED
  value: "10"
- name: ENABLE_SQLITE_STORED_PROCS
  value: "true"
- name: SQLITE_CHECK_SAME_THREAD_FALSE
  value: "true"
- name: WORKFLOW_SCHEDULER_SLEEP_SECS
  value: ".1"

When tested via ghci

import qualified Data.Yaml as Y
import Data.Aeson

> y :: Value <- Y.decodeFileThrow "file.yaml"
> show y -- Shows the value of WORKFLOW_SCHEDULER_SLEEP_SECS as string
"Object (fromList [("env",Array [Object (fromList [("name",String "ACTIVE_API_CALLS_ALLOWED"),("value",String "10")]),Object (fromList [("name",String "ENABLE_SQLITE_STORED_PROCS"),("value",String "true")]),Object (fromList [("name",String "SQLITE_CHECK_SAME_THREAD_FALSE"),("value",String "true")]),Object (fromList [("name",String "WORKFLOW_SCHEDULER_SLEEP_SECS"),("value",String ".1")])])])"
> Y.encode y -- yaml encoding
"env:
- name: ACTIVE_API_CALLS_ALLOWED
  value: '10'
- name: ENABLE_SQLITE_STORED_PROCS
  value: 'true'
- name: SQLITE_CHECK_SAME_THREAD_FALSE
  value: 'true'
- name: WORKFLOW_SCHEDULER_SLEEP_SECS
  value: .1 # no longer a string
"
> encode y -- Aeson encoding
"{"env":[{"name":"ACTIVE_API_CALLS_ALLOWED","value":"10"},{"name":"ENABLE_SQLITE_STORED_PROCS","value":"true"},{"name":"SQLITE_CHECK_SAME_THREAD_FALSE","value":"true"},{"name":"WORKFLOW_SCHEDULER_SLEEP_SECS","value":".1"}]}"

For reference, Aeson behaves correctly keeping the value that was a string as a string. Please let me know if any other information is required.

Thanks,
Rickey