@@ -89,7 +89,7 @@ private static YamlMappingNode ToYamlMapping(this JsonObject obj)
8989        { 
9090            return  new  YamlMappingNode ( obj . ToDictionary ( x =>  ( YamlNode ) new  YamlScalarNode ( x . Key ) 
9191            { 
92-                 Style  =  double . TryParse ( x . Key ,   out   _ )  ?  ScalarStyle . DoubleQuoted  :  ScalarStyle . Plain 
92+                 Style  =  NeedsQuoting ( x . Key )  ?  ScalarStyle . DoubleQuoted  :  ScalarStyle . Plain 
9393            } ,  x =>  x . Value ! . ToYamlNode ( ) ) ) ; 
9494        } 
9595
@@ -135,6 +135,11 @@ ScalarStyle.Plain when YamlNullRepresentations.Contains(yaml.Value) => (JsonValu
135135            } ; 
136136        } 
137137
138+         private  static bool  NeedsQuoting ( string  value )  => 
139+         decimal . TryParse ( value ,  NumberStyles . Float ,  CultureInfo . InvariantCulture ,  out  _ )  || 
140+                                    bool . TryParse ( value ,  out  _ )  || 
141+                                    YamlNullRepresentations . Contains ( value ) ; 
142+ 
138143        private  static YamlScalarNode  ToYamlScalar ( this  JsonValue  val ) 
139144        { 
140145            // Try to get the underlying value based on its actual type 
@@ -145,9 +150,7 @@ private static YamlScalarNode ToYamlScalar(this JsonValue val)
145150                // For string values, we need to determine if they should be quoted in YAML 
146151                // Strings that look like numbers, booleans, or null need to be quoted 
147152                // to preserve their string type when round-tripping 
148-                 var  needsQuoting  =  decimal . TryParse ( stringValue ,  NumberStyles . Float ,  CultureInfo . InvariantCulture ,  out  _ )  || 
149-                                    bool . TryParse ( stringValue ,  out  _ )  || 
150-                                    YamlNullRepresentations . Contains ( stringValue ) ; 
153+                 var  needsQuoting  =  NeedsQuoting ( stringValue ) ; 
151154
152155                return  new  YamlScalarNode ( stringValue ) 
153156                { 
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