Can't directly construct a generic list from a Boolean scalar

[iRon7]

Steps to reproduce

These statements return an error:

[System.Collections.Generic.List[bool]]$False
[System.Collections.Generic.List[bool]]$True
[System.Collections.Generic.List[psobject]]$True
[System.Collections.Generic.List[bool]]($True)

$Bool = $True
[System.Collections.Generic.List[bool]]$Bool

While these statements work fine:

[System.Collections.Generic.List[int]]3
[System.Collections.Generic.List[string]]'Test'
[System.Collections.Generic.List[psobject]]'Test'
[System.Collections.Generic.List[bool]]($True, $True)
[Array]$True

Expected behavior

All statements to return a generic list with a single (boolean) item without any error

Actual behavior

Statements that have a single boolean as constructor parameter produce an error

Error details

InvalidArgument: Cannot convert value "True" to type "System.Collections.Generic.List`1[System.Boolean]". Error: "Invalid cast from 'System.Boolean' to 'System.Collections.Generic.List`1[[System.Boolean, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]]'."

Workaround:

Use the Array subexpression operator @( ):

[System.Collections.Generic.List[bool]]@($True)
$True

Environment data

Name                           Value
----                           -----
PSVersion                      7.2.5
PSEdition                      Core
GitCommitId                    7.2.5
OS                             Microsoft Windows 10.0.22000
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

[vexx32]

Discussed this today with the Engine Working Group.

Definitely looks like a bug to us, we agree this should be fixed. Given the impact is fairly low and the workaround pretty trivial, this is a low priority for the team to handle directly. Marking it as up for grabs for now.

Thanks for reporting this one! 💖

[iRon7]

The Issue-Bug still exists:

$PSVersionTable

Name                           Value
----                           -----
PSVersion                      7.3.9
PSEdition                      Core
GitCommitId                    7.3.9
OS                             Microsoft Windows 10.0.19045
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

[iRon7]

This bug was already qualified for Up-for-Grabs and still exist on PowerShell version: 7.4.2