what’s the meaning of double underscore ($_.value__)?

Question 1

Today on powershell.com

http://powershell.com/cs/blogs/tips/archive/2011/04/26/dump-enumerations.aspx

I’ve found this tip

function Get-Enum($name){
        [Enum]::GetValues($name) | Select-Object @{n="Name";e={$_}},@{n="Value";e={$_.value__}} |
        format-table -autosize
    }

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function Get-Enum($name){

[Enum]::GetValues($name) | Select-Object @{n="Name";e={$_}},@{n="Value";e={$_.value__}} |

format-table -autosize

}

Can someone explain me what’s the meaning of $_.value__ ?
Thanks.

Question 2

I would say this is kind of a hacky way to get the underling value of a enum. Here is the related question and answer:
What is the purpose of the public “value__” field that I can see in Reflector against my enum?

what’s the meaning of double underscore ($_.value__)?

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