Rather better than `$PSBoundParameters`

Get-ParameterValues.ps1

function Get-ParameterValues {
  <#
      .Synopsis
          Get the actual values of parameters which have manually set (non-null) default values or values passed in the call
      .Description
          Unlike $PSBoundParameters, the hashtable returned from Get-ParameterValues includes non-empty default parameter values.
          NOTE: Default values that are the same as the implied values are ignored (e.g.: empty strings, zero numbers, nulls).
      .Link
          https://gist.github.com/Jaykul/72f30dce2cca55e8cd73e97670db0b09/
      .Link
          https://gist.github.com/elovelan/d697882b99d24f1b637c7e7a97f721f2/
      .Example
          function Test-Parameters {
              [CmdletBinding()]
              param(
                  $Name = $Env:UserName,
                  $Age
              )
              $Parameters = Get-ParameterValues
              # This WILL ALWAYS have a value... 
              Write-Host $Parameters["Name"]
              # But this will NOT always have a value... 
              Write-Host $PSBoundParameters["Name"]
          }
  #>
  [CmdletBinding()]
  param()
  # The $MyInvocation for the caller
  $Invocation = Get-Variable -Scope 1 -Name MyInvocation -ValueOnly
  # The $PSBoundParameters for the caller
  $BoundParameters = Get-Variable -Scope 1 -Name PSBoundParameters -ValueOnly
  
  $ParameterValues = @{}
  foreach($parameter in $Invocation.MyCommand.Parameters.GetEnumerator()) {
      # gm -in $parameter.Value | Out-Default
      try {
          $key = $parameter.Key
          if($null -ne ($value = Get-Variable -Name $key -ValueOnly -ErrorAction Ignore)) {
              if($value -ne ($null -as $parameter.Value.ParameterType)) {
                  $ParameterValues[$key] = $value
              }
          }
          if($BoundParameters.ContainsKey($key)) {
              $ParameterValues[$key] = $BoundParameters[$key]
          }
      } finally {}
  }
  $ParameterValues
}