Test-Connection.TraceRoute.TraceRoute works AppVeyor test failed.
Should we restart tests?

-Not parameter was approved in #6464 - should we rename it?

/cc @SimonWahlin @SteveL-MSFT @mklement0

@iSazonov:

No, -IsNullOrEmpty is not appropriate, because -Not has a wider scope, applying to [bool] values too:

[pscustomobject] @{ Foo = $False } | Where-Object -Not Foo   # OK, passes the input object through

@mklement0
Concerning creating an alias -IsNullOrEmpty for -Not parameters #6796 (comment) - this is IMO a totally different meaning and it will be even more confusing than now.

Agree, -IsNullOrEmpty is not ideal for [bool], but -Not has far wider meaning.
For example, it seems totally natural to use it like this:

ps | where name -Not -Eq 'pwsh'

So I think there should be better parameter name.

I believe -IsFalseNullOrEmpty sounds horribly :)

Where-Object is a bool filter - I don't see any problem with -Not.

I agree with @mklement0. -Not also applies to the numeric value 0:

[pscustomobject] @{ Foo = 0 } | Where-Object -Not Foo

I don't see a problem with -Not. It aligns with the -Not operator, which is consistent.

@sethvs:

Sorry for creating confusion: in #6796 (comment) I was speaking in the abstract, giving general advice: you shouldn't just rename existing parameters, because that is a breaking change; if appropriate, a parameter alias can be implemented - but I do not think that that is appropriate here, for the reasons stated by me earlier and also by @iSazonov and @daxian-dbw.

Note that -not is a unary operator in PowerShell, so even in the context of an expression something like $name -Not -Eq 'pwsh' is a syntax error.

The -Not parameter, as the -not operator analog, works as advertised - I don't think it needs another name.

With strings, -Not works like [string]::IsNullOrEmpty(), but, as stated, -Not also works with Booleans and numbers and generally coerces anything to a Boolean based on the concept of "emptiness".

You can think of -Not ... as [bool] (...) -eq $False.

OK.
Not totally convinced but closing.