Blazor InputSelect Errors with "multiple" attribute

[mrlife]

Describe the bug

When adding multiple to an InputSelect input component, running the app, and selecting an item, an error occurs and is displayed in the browser console.

Is multiple supported?

To Reproduce

Search.razor

<InputSelect class="custom-select" @bind-Value="_myModel.SelectedNumbers" id="numbers" multiple>
	<option value="">Select number ...</option>
	<option value="1">One</option>
	<option value="2">Two</option>
</InputSelect>

Search.razor.cs

public IEnumerable<string> UnitIds { get; set; }

Error

Error: System.InvalidOperationException: Microsoft.AspNetCore.Components.Forms.InputSelect1[System.Collections.Generic.IEnumerable1[System.String]] does not support the type 'System.Collections.Generic.IEnumerable1[System.String]'. at Microsoft.AspNetCore.Components.Forms.InputSelect1.TryParseValueFromString(String value, TValue& result, String& validationErrorMessage)
at Microsoft.AspNetCore.Components.Forms.InputBase1.set_CurrentValueAsString(String value) at Microsoft.AspNetCore.Components.Forms.InputSelect1.b__4_0(String __value)
at Microsoft.AspNetCore.Components.EventCallbackFactoryBinderExtensions.<>c__DisplayClass22_0`1.b__0(ChangeEventArgs e)
--- End of stack trace from previous location where exception was thrown ---
at Microsoft.AspNetCore.Components.ComponentBase.CallStateHasChangedOnAsyncCompletion(Task task)
at Microsoft.AspNetCore.Components.RenderTree.Renderer.GetErrorHandledTask(Task taskToHandle)

Further technical details

• ASP.NET Core version: 3.1.2
• The IDE (VS / VS Code/ VS4Mac) you're running on, and it's version: VS Mac 8.5 Preview (8.5 build 3129)
• $ dotnet --info

.NET Core SDK (reflecting any global.json):
Version: 3.1.102
Commit: 573d158fea

Runtime Environment:
OS Name: Mac OS X
OS Version: 10.15
OS Platform: Darwin
RID: osx.10.15-x64
Base Path: /usr/local/share/dotnet/sdk/3.1.102/

Host (useful for support):
Version: 3.1.2
Commit: 916b5cba26

.NET Core SDKs installed:
3.1.102 [/usr/local/share/dotnet/sdk]

.NET Core runtimes installed:
Microsoft.AspNetCore.App 3.1.2 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 3.1.2 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]

[SteveSandersonMS]

It's not currently supported. This is tracked by #5519, so closing as duplicate.

[mrlife]

@SteveSandersonMS I see, thank you. The #5519 hasn't been updated with a status for almost 2 years. Possible to provide an update there?