fix: InputObject hashtable no longer mutated by Get-Dependency (#35)

Parse-Dependency called $Dependencies.Remove('PSDependOptions') on the
original hashtable because $Dependencies was assigned by reference.
Clone each element before Parse-Dependency runs so the caller's object
is left intact and a second Invoke-PSDepend / Get-Dependency call still
honours PSDependOptions (e.g. Target).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: HeyItsGilbert

CHANGELOG.md

@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed
+
+- `Get-Dependency -InputObject` no longer mutates the caller's hashtable:
+  `PSDependOptions` is now preserved after the call, so a second invocation
+  with the same object still honors global options such as `Target` (#35).
+
 ## [0.4.1] - 2026-06-12
 
 ### Added

PSDepend/Public/Get-Dependency.ps1

@@ -437,7 +437,7 @@
     elseif ($PSCmdlet.ParameterSetName -eq 'Hashtable') {
         $DependencyFile = 'Hashtable'
         $ParsedDependencies = foreach ($InputDependency in $InputObject) {
-            $Dependencies = $InputDependency
+            $Dependencies = $InputDependency.Clone()
 
             Parse-Dependency -ParamSet $PSCmdlet.ParameterSetName
         }

Tests/PSDepend.Tests.ps1

@@ -119,6 +119,26 @@ Describe "Get-Dependency PS$PSVersion" -Tag 'Unit' {
             $Dependencies | Should -BeNullOrEmpty
         }
 
+        It 'Does not mutate the caller''s InputObject — PSDependOptions key survives after Get-Dependency' {
+            $inputObj = @{
+                PSDependOptions = @{ Target = 'CurrentUser' }
+                Pester          = 'latest'
+            }
+            $null = Get-Dependency -InputObject $inputObj
+            $inputObj.ContainsKey('PSDependOptions') | Should -Be $True
+        }
+
+        It 'Does not mutate the caller''s InputObject — PSDependOptions honored on a second Get-Dependency call' {
+            $inputObj = @{
+                PSDependOptions = @{ Target = 'CurrentUser' }
+                Pester          = 'latest'
+            }
+            $null = Get-Dependency -InputObject $inputObj
+            $null = Get-Dependency -InputObject $inputObj
+            $inputObj.ContainsKey('PSDependOptions') | Should -Be $True
+            $inputObj.PSDependOptions.Target | Should -Be 'CurrentUser'
+        }
+
         It 'Parses -InputObject hashtable as PSGalleryModule by default' {
             $Dependencies = Get-Dependency -InputObject @{ Pester = 'latest' }
             $Dependencies.DependencyName | Should -Be 'Pester'