Modernize code.

Author: ioquatix

.github/workflows/documentation-coverage.yaml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - uses: ruby/setup-ruby@v1
       with:
         ruby-version: ruby

.github/workflows/documentation.yaml

@@ -24,7 +24,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
 
     - uses: ruby/setup-ruby@v1
       with:
@@ -39,7 +39,7 @@ jobs:
       run: bundle exec bake utopia:project:static --force no
 
     - name: Upload documentation artifact
-      uses: actions/upload-pages-artifact@v3
+      uses: actions/upload-pages-artifact@v4
       with:
         path: docs
 

.github/workflows/rubocop.yaml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - uses: ruby/setup-ruby@v1
       with:
         ruby-version: ruby

.github/workflows/test-coverage.yaml

@@ -26,10 +26,13 @@ jobs:
             ruby: "3.4"
             io_event_selector: EPoll
           - os: ubuntu
-            ruby: "3.4"
+            ruby: "4.0"
+            io_event_selector: EPoll
+          - os: ubuntu
+            ruby: "4.0"
             io_event_selector: URing
           - os: ubuntu
-            ruby: "3.4"
+            ruby: "4.0"
             io_event_selector: URing
             fiber_profiler_capture: "true"
           - os: ubuntu
@@ -46,7 +49,7 @@ jobs:
       FIBER_PROFILER_CAPTURE: ${{matrix.fiber_profiler_capture}}
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - uses: ruby/setup-ruby-pkgs@v1
       with:
         ruby-version: ${{matrix.ruby}}
@@ -58,7 +61,7 @@ jobs:
       timeout-minutes: 5
       run: bundle exec bake test
 
-    - uses: actions/upload-artifact@v4
+    - uses: actions/upload-artifact@v5
       with:
         include-hidden-files: true
         if-no-files-found: error
@@ -70,13 +73,13 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - uses: ruby/setup-ruby@v1
       with:
         ruby-version: ruby
         bundler-cache: true
 
-    - uses: actions/download-artifact@v4
+    - uses: actions/download-artifact@v6
 
     - name: Validate coverage
       timeout-minutes: 5

.github/workflows/test-external.yaml

@@ -20,9 +20,10 @@ jobs:
           - "3.2"
           - "3.3"
           - "3.4"
+          - "4.0"
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - uses: ruby/setup-ruby@v1
       with:
         ruby-version: ${{matrix.ruby}}

.github/workflows/test-io_uring.yaml

@@ -22,7 +22,8 @@ jobs:
         ruby:
           - "3.3"
           - "3.4"
-          - "head"
+          - "4.0"
+          - head
 
     steps:
     - uses: actions/checkout@v3

.github/workflows/test-select.yaml

@@ -24,7 +24,8 @@ jobs:
           - "3.2"
           - "3.3"
           - "3.4"
-          - "head"
+          - "4.0"
+          - head
 
     steps:
     - uses: actions/checkout@v3

.github/workflows/test-worker-pool.yaml

@@ -20,8 +20,8 @@ jobs:
           - ubuntu
 
         ruby:
-          - "3.4"
-          - "head"
+          - "4.0"
+          - head
 
     steps:
     - uses: actions/checkout@v3

.github/workflows/test.yaml

@@ -21,6 +21,7 @@ jobs:
           - "3.2"
           - "3.3"
           - "3.4"
+          - "4.0"
 
         experimental: [false]
 
@@ -36,7 +37,7 @@ jobs:
             experimental: true
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - uses: ruby/setup-ruby@v1
       with:
         ruby-version: ${{matrix.ruby}}

lib/async/promise.rb

@@ -2,7 +2,7 @@
 
 # Released under the MIT License.
 # Copyright, 2025, by Shopify Inc.
-# Copyright, 2025, by Samuel Williams.
+# Copyright, 2025-2026, by Samuel Williams.
 
 module Async
 	# A promise represents a value that will be available in the future.