Invoke-RestMethod doesn't properly handle JSON object conversion for APIs that return varying casings of the same spellings

[nkasco]

Prerequisites

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Steps to reproduce

See #3705 as it is essentially the same issue, just in this case Invoke-RestMethod spits out a string instead of an object simply due to the result containing multiple variations of the same spelling (but different spelling casings)

Expected behavior

Typical API results from Invoke-RestMethod, objects, not strings.

Actual behavior

Invoke-RestMethod returns a string that is not converted from JSON, even though the output is indeed valid JSON.

Error details

ConvertFrom-JSON : Cannot convert the JSON string because a dictionary that was converted from the string contains the duplicated keys <Key> and <KEY>. Please use the -AsHashTable switch instead.

Using -AsHashTable does work, but this functionality should be integrated with Invoke-RestMethod to avoid entirely.

Environment data

Name                           Value
----                           -----
PSVersion                      7.4.1
PSEdition                      Core
GitCommitId                    7.4.1
OS                             Microsoft Windows 10.0.22631
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

Visuals

No response

[nkasco]

Just realized this is a duplicate of #19378, closing and we can continue the conversation there.

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