diff --git a/src/Abilities/Rev.php b/src/Abilities/Rev.php
index 8b1ca36..457e245 100644
--- a/src/Abilities/Rev.php
+++ b/src/Abilities/Rev.php
@@ -32,4 +32,14 @@ final class Rev
             (string) $post->post_modified_gmt,
         ]));
     }
+
+    /**
+     * Whether $input carries the current rev of $post (optimistic lock of the post tools).
+     *
+     * @param array<string, mixed> $input
+     */
+    public static function matches(array $input, WP_Post $post): bool
+    {
+        return isset($input['rev']) && $input['rev'] === self::ofPost($post);
+    }
 }
diff --git a/src/Integrations/WordPress/Content/ContentUpdateAbility.php b/src/Integrations/WordPress/Content/ContentUpdateAbility.php
index 0ac8692..fe92ad2 100644
--- a/src/Integrations/WordPress/Content/ContentUpdateAbility.php
+++ b/src/Integrations/WordPress/Content/ContentUpdateAbility.php
@@ -109,7 +109,7 @@ final class ContentUpdateAbility implements Ability
             return $post;
         }
 
-        if (! isset($input['rev']) || $input['rev'] !== Rev::ofPost($post)) {
+        if (! Rev::matches($input, $post)) {
             return Errors::revMismatch();
         }
 
diff --git a/src/Integrations/WordPress/Revisions/RevisionRestoreAbility.php b/src/Integrations/WordPress/Revisions/RevisionRestoreAbility.php
index 210d6c3..4055bd7 100644
--- a/src/Integrations/WordPress/Revisions/RevisionRestoreAbility.php
+++ b/src/Integrations/WordPress/Revisions/RevisionRestoreAbility.php
@@ -107,7 +107,7 @@ final class RevisionRestoreAbility implements Ability
             ));
         }
 
-        if (! isset($input['rev']) || $input['rev'] !== Rev::ofPost($post)) {
+        if (! Rev::matches($input, $post)) {
             return Errors::revMismatch();
         }
 
diff --git a/src/Integrations/WordPress/Status/PostReplaceWithCopyAbility.php b/src/Integrations/WordPress/Status/PostReplaceWithCopyAbility.php
index 2549d54..0386f45 100644
--- a/src/Integrations/WordPress/Status/PostReplaceWithCopyAbility.php
+++ b/src/Integrations/WordPress/Status/PostReplaceWithCopyAbility.php
@@ -185,7 +185,7 @@ final class PostReplaceWithCopyAbility implements Ability
             );
         }
 
-        if (! isset($input['rev']) || $input['rev'] !== Rev::ofPost($original)) {
+        if (! Rev::matches($input, $original)) {
             return Errors::revMismatch();
         }
 
diff --git a/tests/Unit/Abilities/RevAndJsonMapTest.php b/tests/Unit/Abilities/RevAndJsonMapTest.php
index 096fe56..bce6cf1 100644
--- a/tests/Unit/Abilities/RevAndJsonMapTest.php
+++ b/tests/Unit/Abilities/RevAndJsonMapTest.php
@@ -39,6 +39,16 @@ final class RevAndJsonMapTest extends TestCase
         }
     }
 
+    public function testMatchesComparesInputRevWithThePostRev(): void
+    {
+        $post = new WP_Post(['post_title' => 'T']);
+
+        self::assertTrue(Rev::matches(['rev' => Rev::ofPost($post)], $post));
+        self::assertFalse(Rev::matches(['rev' => 'abcdefabcdef'], $post));
+        self::assertFalse(Rev::matches([], $post));
+        self::assertFalse(Rev::matches(['rev' => 123], $post));
+    }
+
     public function testEmptyMapBecomesJsonObject(): void
     {
         self::assertInstanceOf(stdClass::class, JsonMap::of([]));