From dce897aa4f3c24099a57faa25002d56fd982a8cc Mon Sep 17 00:00:00 2001
From: marcoarment <me@marco.org>
Date: Tue, 24 Oct 2023 16:11:41 -0400
Subject: [PATCH] Tiny improvements

---
 Package.swift                            | 2 +-
 Sources/Blackbird/BlackbirdChanges.swift | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/Package.swift b/Package.swift
index 1129db9..eafa9f5 100644
--- a/Package.swift
+++ b/Package.swift
@@ -22,7 +22,7 @@ let package = Package(
             name: "Blackbird",
             dependencies: [],
             swiftSettings: [
-//                .unsafeFlags(["-Xfrontend", "-warn-concurrency"]) // Uncomment for Sendable testing
+//                .enableExperimentalFeature("StrictConcurrency"),  // Uncomment for Sendable testing
             ]
         ),
         .testTarget(
diff --git a/Sources/Blackbird/BlackbirdChanges.swift b/Sources/Blackbird/BlackbirdChanges.swift
index 3af016b..115b185 100644
--- a/Sources/Blackbird/BlackbirdChanges.swift
+++ b/Sources/Blackbird/BlackbirdChanges.swift
@@ -118,6 +118,12 @@ public extension Blackbird {
             guard let columnNames else { return true }
             return columnNames.contains(T.table.keyPathToColumnName(keyPath: keyPath))
         }
+        
+        /// The set of primary-key values that may have changed, or `nil` if any primary key may have changed.
+        public var changedPrimaryKeys: PrimaryKeyValues? {
+            if let primaryKeys, primaryKeys.count > 0 { return primaryKeys }
+            return nil
+        }
 
         internal init(type: T.Type, from change: Change) {
             self.type = type