Experimenting with boolean parameters and switches in reply to https://www.reddit.com/r/PowerShell/comments/4eth2w/switch_parameters_vs_interactive_input/

Fail-detect-parameter-presence.ps1

function Get-Hype {
    param (
        [switch]$CleganeBowl,
        [switch]$KingsMoot
    )
    New-Object psobject -Property ([ordered]@{
        CleganeBowl = $CleganeBowl
        CleganeBowlIsPresent = $CleganeBowl.IsPresent
        CleganeBowlBound = $PSBoundParameters.ContainsKey('CleganeBowl')
        KingsMoot = $KingsMoot
        KingsMootIsPresent = $KingsMoot.IsPresent
        KingsMootBound = $PSBoundParameters.ContainsKey('KingsMoot')
    })
}

Get-Hype
# CleganeBowl          : False
# CleganeBowlIsPresent : False
# CleganeBowlBound     : False
# KingsMoot            : False
# KingsMootIsPresent   : False
# KingsMootBound       : False

Get-Hype -CleganeBowl
# CleganeBowl          : True
# CleganeBowlIsPresent : True
# CleganeBowlBound     : True
# KingsMoot            : False
# KingsMootIsPresent   : False
# KingsMootBound       : False


Get-Hype -CleganeBowl -KingsMoot=$false
# CleganeBowl          : True
# CleganeBowlIsPresent : True
# CleganeBowlBound     : True
# KingsMoot            : False
# KingsMootIsPresent   : False
# KingsMootBound       : False

$Parameters = @{
    CleganeBowl = $true
    KingsMoot = $false
}
Get-Hype @Parameters
# CleganeBowl          : True
# CleganeBowlIsPresent : True
# CleganeBowlBound     : True
# KingsMoot            : False
# KingsMootIsPresent   : False
# KingsMootBound       : True

$Parameters = @{
    CleganeBowl = $true
}
Get-Hype @Parameters
# CleganeBowl          : True
# CleganeBowlIsPresent : True
# CleganeBowlBound     : True
# KingsMoot            : False
# KingsMootIsPresent   : False
# KingsMootBound       : False

# Actually these last two examples technically do detect, but I can't see a use case, especially in relation to the linked reddit question

Success-detect-non-switch-param-presence.ps1

function Get-Hype {
    param (
        $CleganeBowl = $false,
        $KingsMoot = $false
    )
    New-Object psobject -Property ([ordered]@{
        CleganeBowl = $CleganeBowl
        CleganeBowlBound = $PSBoundParameters.ContainsKey('CleganeBowl')
        KingsMoot = $KingsMoot
        KingsMootBound = $PSBoundParameters.ContainsKey('KingsMoot')
    })
}

Get-Hype | Format-List
# CleganeBowl      : False
# CleganeBowlBound : False
# KingsMoot        : False
# KingsMootBound   : False

Get-Hype -CleganeBowl $true | Format-List
# CleganeBowl      : True
# CleganeBowlBound : True
# KingsMoot        : False
# KingsMootBound   : False

Get-Hype -CleganeBowl $true -KingsMoot $false | Format-List
# CleganeBowl      : True
# CleganeBowlBound : True
# KingsMoot        : False
# KingsMootBound   : True

$Parameters = @{
    CleganeBowl = $true
    KingsMoot = $false
}
Get-Hype @Parameters | Format-List
# CleganeBowl      : True
# CleganeBowlBound : True
# KingsMoot        : False
# KingsMootBound   : True

$Parameters = @{
    CleganeBowl = $true
}
Get-Hype @Parameters | Format-List
# CleganeBowl      : True
# CleganeBowlBound : True
# KingsMoot        : False
# KingsMootBound   : False