Don't execute @FetchOne queries for _Selections. (#246)

* Don't execute `@FetchOne` queries for `_Selection`s.

* wip

Author: stephencelis

Examples/Examples.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved

@@ -36,7 +36,7 @@ let package = Package(
     .package(url: "https://github.com/pointfreeco/swift-snapshot-testing", from: "1.18.4"),
     .package(
       url: "https://github.com/pointfreeco/swift-structured-queries",
-      from: "0.22.0",
+      branch: "optional-selections",
       traits: [
         .trait(name: "StructuredQueriesTagged", condition: .when(traits: ["SQLiteDataTagged"]))
       ]

Package.resolved

@@ -28,7 +28,7 @@ let package = Package(
     .package(url: "https://github.com/pointfreeco/swift-dependencies", from: "1.9.0"),
     .package(url: "https://github.com/pointfreeco/swift-sharing", from: "2.3.0"),
     .package(url: "https://github.com/pointfreeco/swift-snapshot-testing", from: "1.18.4"),
-    .package(url: "https://github.com/pointfreeco/swift-structured-queries", from: "0.22.0"),
+    .package(url: "https://github.com/pointfreeco/swift-structured-queries", branch: "optional-selections"),
     .package(url: "https://github.com/pointfreeco/xctest-dynamic-overlay", from: "1.5.0"),
   ],
   targets: [

Package.swift

@@ -121,6 +121,18 @@ public struct FetchOne<Value: Sendable>: Sendable {
     )
   }
 
+  /// Initializes this property with a wrapped value.
+  ///
+  /// - Parameter wrappedValue: A default value to associate with this property.
+  public init(wrappedValue: sending Value)
+  where
+    Value: _OptionalProtocol,
+    Value: _Selection,
+    Value.QueryOutput == Value
+  {
+    sharedReader = SharedReader(value: wrappedValue)
+  }
+
   /// Initializes this property with a query associated with the wrapped value.
   ///
   /// - Parameters: