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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"An incidentally `[psobject]`-wrapped strongly typed array isn't recognized as such in argument-based parameter binding","articleBody":"### Prerequisites\r\n\r\n- [X] Write a descriptive title.\r\n- [X] Make sure you are able to repro it on the [latest released version](https://github.com/PowerShell/PowerShell/releases)\r\n- [X] Search the existing issues.\r\n- [X] Refer to the [FAQ](https://github.com/PowerShell/PowerShell/blob/master/docs/FAQ.md).\r\n- [X] Refer to [Differences between Windows PowerShell 5.1 and PowerShell](https://learn.microsoft.com/powershell/scripting/whats-new/differences-from-windows-powershell).\r\n\r\n### Steps to reproduce\r\n\r\nNote:\r\n* This is yet another manifestation of #5579\r\n\r\n```powershell\r\n# Create and import a sample cmdlet that requires [byte[]] input\r\nAdd-Type @'\r\nusing System.Management.Automation;\r\n[Cmdlet(\"Get\", \"Foo\")]\r\npublic class GetFooCommand : PSCmdlet\r\n{\r\n    [Parameter(Mandatory=true,ValueFromPipeline=true)]\r\n    public byte[] InputObject;\r\n\r\n    protected override void ProcessRecord()\r\n    {\r\n    }\r\n}\r\n'@ -PassThru | ForEach-Object Assembly | Import-Module\r\n\r\n# Create two instances of a large byte array, one without and\r\n# one with a [psobject] wrapper\r\n$byteArrayUnwrapped = [byte[]]::new(64mb)\r\n$byteArrayWrapped = New-Object byte[] 64mb  # equivalent, but with implicit [psobject] wrapper\r\n\r\n'--- unwrapped'\r\nGet-Foo -InputObject $byteArrayUnwrapped\r\n'--- wrapped'\r\nGet-Foo -InputObject $byteArrayWrapped # !! Excessively slow.\r\n'--- done'\r\n```\r\n\r\nNote that parameter binding _via the pipeline_ is _not_ affected; that is, \r\n`, $byteArrayWrapped | Get-Foo` works as intended (note the need to wrap `$byteArrayWrapped` in an aux., transitory array via the unary form of `,` so as to ensure that it is passed as a _single object_).\r\n\r\n### Expected behavior\r\n\r\nBoth calls should return virtually instantly, given that the argument type exactly matches the parameter type and that the cmdlet is otherwise a no-op.\r\n\r\n### Actual behavior\r\n\r\nThe second call, due to the invisible `[psobject]` wrapper resulting from use of `New-Object` to construct the array, takes an excessive amount of time to complete.\r\n\r\n\r\n### Error details\r\n\r\n_No response_\r\n\r\n### Environment data\r\n\r\n```powershell\r\nPowerShell 7.5.0-preview.2\r\n```\r\n\r\n\r\n### Visuals\r\n\r\n_No response_","author":{"url":"https://github.com/mklement0","@type":"Person","name":"mklement0"},"datePublished":"2024-04-17T20:38:27.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":8},"url":"https://github.com/21496/PowerShell/issues/21496"}