JSON: make ObservableJsonValue comparable

- implement IComparable<ObservableJsonValue> and IComparable<JsonValue>

Author: KrzysFR

Doxense.Core/Serialization/JSON/Observable/ObservableJsonValue.cs

@@ -14,7 +14,7 @@ namespace Doxense.Serialization.Json
 /// <summary>Observable JSON Object that will capture all reads</summary>
 [DebuggerDisplay("{ToString(),nq}")]
 [PublicAPI]
-public sealed class ObservableJsonValue : IJsonProxyNode, IJsonSerializable, IJsonPackable, IEquatable<ObservableJsonValue>, IEquatable<JsonValue>, IEnumerable<ObservableJsonValue>
+public sealed class ObservableJsonValue : IJsonProxyNode, IJsonSerializable, IJsonPackable, IEquatable<ObservableJsonValue>, IEquatable<JsonValue>, IComparable<ObservableJsonValue>, IComparable<JsonValue>, IEnumerable<ObservableJsonValue>
 {
 
 public ObservableJsonValue(IObservableJsonContext? ctx, IJsonProxyNode? parent, JsonPathSegment segment, JsonValue json)
@@ -1097,8 +1097,16 @@ public IEnumerator<ObservableJsonValue> GetEnumerator()
 /// <inheritdoc />
 public bool Equals(JsonValue? other) => other == null ? IsNullOrMissing() : this.ToJson().StrictEquals(other);
 
+/// <inheritdoc />
+public int CompareTo(ObservableJsonValue? other) => other != null ? this.ToJson().CompareTo(other.ToJson()) : Exists() ? +1 : 0;
+
+/// <inheritdoc />
+public int CompareTo(JsonValue? other) => other != null ? this.ToJson().CompareTo(other) : Exists() ? +1 : 0;
+
+/// <inheritdoc />
 void IJsonSerializable.JsonSerialize(CrystalJsonWriter writer) => this.ToJson().JsonSerialize(writer);
 
+/// <inheritdoc />
 JsonValue IJsonPackable.JsonPack(CrystalJsonSettings settings, ICrystalJsonTypeResolver resolver) => this.ToJson();
 
 public JsonArray AsArray() => this.ToJson().AsArray();