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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"The -f operator doesn't recognize a [psobject]-wrapped array","articleBody":"Note: This is ultimately another manifestation of #5579.\r\n\r\n`-f`, when passed an array that is invisibly `[psobject]`-wrapped, fails to recognize the array as such.\r\n\r\nThis can happen with arrays returned _as a whole_ from cmdlets, such as with `Write-Output -NoEnumerate` and `Get-Content -ReadCount`.\r\n\r\nSimplest, but contrived repro: `'{0} {1}' -f ([psobject] (1, 2))`\r\n\r\nNote:\r\n*  When using an untyped function/script _parameter_, `[psobject]` wrapping does _not_ occur with arrays; it does, however, occur with scalar barewords that can be parsed _as numbers_, and then causes a similar problem: #17199\r\n\r\n\r\n## Steps to reproduce\r\n\r\n```powershell\r\n# Create two 2-element arrays: one with an expression, another via a cmdlet.\r\n$arr1 = 1, 2\r\n$arr2 = Write-Output -NoEnumerate 1, 2\r\n\r\n'{0} {1}' -f $arr1 | Should -Be '1 2'\r\n'{0} {1}' -f $arr2 | Should -Be '1 2'\r\n```\r\n\r\n## Expected behavior\r\n\r\nBoth tests should succeed.\r\n\r\n## Actual behavior\r\n\r\nThe 2nd test fails, because `$arr2` is (invisibly) `[psobject]`-wrapped.\r\n\r\n```none\r\nInvalidOperation: Error formatting a string: Index (zero based) must be greater than or equal to zero and less than the size of the argument list..\r\n```\r\n\r\n## Environment data\r\n\r\n```none\r\nPowerShell Core 7.2.0-preview.1\r\n```\r\n","author":{"url":"https://github.com/mklement0","@type":"Person","name":"mklement0"},"datePublished":"2020-12-08T21:35:20.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/14355/PowerShell/issues/14355"}