The parameter attribute ValueFromRemainingArguments is a handy feature in
special cases. All unknown parameters and arguments go to this parameter
value. A command processes it as required by its design.
But such a parameter introduces unfortunate side effects. For example, if an
existing parameter name is misspelled then it is not an error anymore. Instead,
the wrong parameter goes to ValueFromRemainingArguments. A command may even
work without errors with such a mistake. But the results are probably wrong.
Some known built-in commands with ValueFromRemainingArguments parameters,
see Get-VFRACommandParameter.ps1:
Command Parameter
------- ---------
ForEach-Object RemainingScripts
ForEach-Object ArgumentList
Get-Command ArgumentList
New-Module ArgumentList
Read-Host Prompt
Trace-Command ArgumentList
Write-Host Object
Write-Output InputObject
The script Test-1.ps1 shows how a typo in the parameter name of
Get-Command is not treated as an error and the command does not fail, too.
But it gets a wrong result.
In v7.1.0-preview.2 the behaviour changed. Get-Command fails with some not
clear error due to the apparently misspelled parameter. In the ideal world we
would get some "invalid parameter" error. But in reality the misspelled input
goes to ArgumentList due to its ValueFromRemainingArguments and the error
looks cryptic or misleading.