ConverTo-Json altering intended output - powershell

Question

I have a psobject that is created from the JSON output of an Invoke-RestMethod. My intention is to change one value, convert back to JSON, then add back to the application REST API with another Invoke-RestMethod. I have done this several times in the past with the same REST API so I'm not sure why this one isn't working.
The psobject $restOut looks like this:
id: 123
limit: #{limitMb=0; limitPercent=0}
The next block of code changes the id if the new id I want isn't already set
$newId = 456
if($restOut.id -ne $newId){
$restOut.id = $newId
$inputJson = $restOut | ConvertTo-Json -Depth 2
Invoke-RestMethod -Uri $restURl -Method PUT -Body $inputJson
}
I'm expecting $inputJson to look like this (and the psobject $restOut does match the expectation):
{
"id": "456",
"limit": {
"limitMb": 0,
"limitPercent": 0
}
}
But what I'm actually getting is:
{
"id": {
"value": "456",
"id": "456"
},
"limit": {
"limitMb": 0,
"limitPercent": 0
}
}
As said, I've done this exact manipulation many times in other scripts targeting the same software API, and am just at a loss with the behavior this time. Any help is appreciated. Thanks!

Answer 1

Easy fix
This was a simplified sample. In my actual script $newId = 456 was actually being assigned from another API call. Therefore it was also an object. Simply quoting it in the line that changes the id to make it a string fixed the issue:
$restOut.id = "$newId"
instead of
$restOut.id = $newId