Private/Install/Resolve-PWSHYBKPIVArchitecture.ps1

function Resolve-PWSHYBKPIVArchitecture {
    <#
    .SYNOPSIS
        Resolves the configured installation architecture to win32 or win64.
    .DESCRIPTION
        "auto" (the default) resolves via [Environment]::Is64BitOperatingSystem; "win32" or
        "win64" pass through unchanged as an explicit override. Any other value is a
        configuration error and throws.
    .PARAMETER Architecture
        The installation.architecture config value: "auto", "win32", or "win64".
    .OUTPUTS
        String. "win32" or "win64".
    .EXAMPLE
        Resolve-PWSHYBKPIVArchitecture -Architecture 'auto'
    #>

    [CmdletBinding()]
    [OutputType([string])]
    param(
        [Parameter(Mandatory)]
        [string] $Architecture
    )

    switch ($Architecture) {
        'auto' { if ([Environment]::Is64BitOperatingSystem) { 'win64' } else { 'win32' } }
        'win32' { 'win32' }
        'win64' { 'win64' }
        default { throw "installation.architecture '$Architecture' is not one of auto/win32/win64." }
    }
}