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v5 Regression: Casting object[] to more narrow generic collection fails with a single element, but not with two #2208

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v5 Regression: Casting object[] to more narrow generic collection fails with a single element, but not with two#2208
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daxian-dbw
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Issue-BugIssue has been identified as a bug in the productIssue has been identified as a bug in the productWG-Enginecore PowerShell engine, interpreter, and runtimecore PowerShell engine, interpreter, and runtime
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6.0.0-NiceToHave
@oising

Description

@oising
oising
opened on Sep 8, 2016
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Steps to reproduce

> [Collections.Generic.List[int]]@(1)

or

> [Management.Automation.LanguagePrimitives]::ConvertTo(@(1), [Collections.Generic.List[int]])

Note that casting @(1,2) will succeed. Only the case @(1) fails. This is a regression because it functions correctly in v4.

Expected behavior

Casts to an instance of List<int> containing a single element: 1

Actual behavior

Exception calling "ConvertTo" with "2" argument(s): "Cannot convert the "System.Object[]" value of type "System.Object[]" to type "System.Int32"."

Environment data

> $PSVersionTable

Name                           Value
----                           -----
PSVersion                      5.0.10586.494
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}
BuildVersion                   10.0.10586.494
CLRVersion                     4.0.30319.42000
WSManStackVersion              3.0
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
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Issue-BugIssue has been identified as a bug in the productIssue has been identified as a bug in the productWG-Enginecore PowerShell engine, interpreter, and runtimecore PowerShell engine, interpreter, and runtime

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