20/11/02 21:48:13.16 Qlwbnxz+.net
{ $a } は { Write-Output $a } の事
Write-Output に配列を渡した時の挙動を考えればいい
URLﾘﾝｸ(docs.microsoft.com)
By default, Write-Output enumerates through collections provided to the cmdlet.
However, Write-Output can also be used to pass collections down the pipeline as a single object with the NoEnumerate parameter.