Add public IOptionalValue for IsSpecified access

src/OptionalValues/IOptionalValue.cs

@@ -0,0 +1,12 @@
+namespace OptionalValues;
+
+/// <summary>
+/// Represents an optional value that may or may not be specified.
+/// </summary>
+public interface IOptionalValue
+{
+    /// <summary>
+    /// Whether the value is specified.
+    /// </summary>
+    bool IsSpecified { get; }
+}

src/OptionalValues/Internal/IOptionalValueInternals.cs

@@ -1,9 +1,7 @@
-namespace OptionalValues.Internal;
+namespace OptionalValues.Internal;
 
-internal interface IOptionalValueInternals
+internal interface IOptionalValueInternals : IOptionalValue
 {
-    bool IsSpecified { get; }
-
     object? GetValue();
 
     object? GetSpecifiedValue();

src/OptionalValues/PublicAPI.Unshipped.txt

@@ -0,0 +1,3 @@
+#nullable enable
+OptionalValues.IOptionalValue
+OptionalValues.IOptionalValue.IsSpecified.get -> bool

test/OptionalValues.Tests/OptionalValueTest.cs

@@ -55,6 +55,25 @@ public void Should_Be_True_For(string? value)
         }
     }
 
+    public class PublicInterface : OptionalValueTest
+    {
+        [Fact]
+        public void Should_Be_Implemented_By_OptionalValue()
+        {
+            IOptionalValue sut = new OptionalValue<string?>("Value");
+
+            sut.IsSpecified.ShouldBeTrue();
+        }
+
+        [Fact]
+        public void Should_Expose_Unspecified_State()
+        {
+            IOptionalValue sut = OptionalValue<string?>.Unspecified;
+
+            sut.IsSpecified.ShouldBeFalse();
+        }
+    }
+
     public class Value : OptionalValueTest
     {
         [Fact]