.psobject.baseobject only sometimes returns the undecorated underlying .NET type instance

[mklement0]

Note: Not sure if use of .psobject.BaseObject is officially supported in PowerShell code. It can be handy as a workaround in certain situations, but isn't consistently supported.

Steps to reproduce

# The case that works as expected, with an ETS-decorated [string]
'hi' > t.txt; $str = Get-Content -Raw t.txt
($str | Get-Member -Type NoteProperty).Count
($str.psobject.BaseObject | Get-Member -Type NoteProperty).Count
'---'
# Doesn't seem to work with other types.
(Get-Date  | Get-Member -Type NoteProperty).Count
((Get-Date).psobject.BaseObject  | Get-Member -Type NoteProperty).Count

Expected behavior

6
0
---
1
0

That is, applying .psobject.BaseObject should eliminate the ETS NoteProperty members in both cases.

Actual behavior

6
0
---
1
1

That is, applying .psobject.BaseObject to the [datetime] instance did not eliminate the NoteProperty members.

Environment data

PowerShell Core v6.2.0-preview.4 on macOS 10.14.2
PowerShell Core v6.2.0-preview.4 on Ubuntu 18.04.1 LTS
PowerShell Core v6.2.0-preview.4 on Microsoft Windows 10 Pro (64-bit; Version 1803, OS Build: 17134.471)
Windows PowerShell v5.1.17134.407 on Microsoft Windows 10 Pro (64-bit; Version 1803, OS Build: 17134.471)

[microsoft-github-policy-service]

This issue has not had any activity in 6 months, if this is a bug please try to reproduce on the latest version of PowerShell and reopen a new issue and reference this issue if this is still a blocker for you.

[microsoft-github-policy-service]

This issue has not had any activity in 6 months, if this is a bug please try to reproduce on the latest version of PowerShell and reopen a new issue and reference this issue if this is still a blocker for you.

[microsoft-github-policy-service]

This issue has not had any activity in 6 months, if this is a bug please try to reproduce on the latest version of PowerShell and reopen a new issue and reference this issue if this is still a blocker for you.

[microsoft-github-policy-service]

This issue has been marked as "No Activity" as there has been no activity for 6 months. It has been closed for housekeeping purposes.