Revert "Fix losing case sensitive keys"

This reverts commit 7980c7c.

Signed-off-by: Gabriel Adrian Samfira <gsamfira@cloudbasesolutions.com>

Author: gabriel-samfira

Tests/powershell-yaml.Tests.ps1

@@ -693,13 +693,4 @@ int64: 9223372036854775807
             } | Should -Not -Throw
         }
     }
-
-    Describe 'Case insensitive keys in mappings' {
-        It 'should deserialize both keys' {
-            $yaml = '{"a": 1, "A": 2}'
-            $result = ConvertFrom-Yaml -Yaml $yaml
-            $result.a | Should -Be 1
-            $result.A | Should -Be 2
-        }
-    }
 }

powershell-yaml.psm1

@@ -244,7 +244,7 @@ function Convert-YamlMappingToHashtable {
         [switch] $Ordered
     )
     PROCESS {
-        if ($Ordered) { $ret = [System.Collections.Specialized.OrderedDictionary]::new() } else { $ret = [hashtable]::new() }
+        if ($Ordered) { $ret = [ordered]@{} } else { $ret = @{} }
         foreach($i in $Node.Children.Keys) {
             $ret[$i.Value] = Convert-YamlDocumentToPSObject $Node.Children[$i] -Ordered:$Ordered
         }