diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 7df0721..c92fc1c 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -16,7 +16,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php: [ '7.4', '8.0', '8.1', '8.2', '8.3', '8.4' ]
+        php: [ '8.1', '8.2', '8.3', '8.4' ]
         os: [ ubuntu-latest, macos-latest, windows-latest ]
         stability: [ prefer-lowest, prefer-stable ]
     steps:
diff --git a/composer.json b/composer.json
index ba46dea..fda5fb6 100644
--- a/composer.json
+++ b/composer.json
@@ -36,8 +36,8 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "4.x-dev",
-            "dev-main": "4.x-dev"
+            "dev-master": "3.x-dev",
+            "dev-main": "3.x-dev"
         }
     },
     "config": {
diff --git a/src/IntervalInterface.php b/src/IntervalInterface.php
new file mode 100644
index 0000000..001a91b
--- /dev/null
+++ b/src/IntervalInterface.php
@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Phplrt\Contracts\Position;
+
+/**
+ * @deprecated since phplrt 3.4 and will be removed in 4.0.
+ */
+interface IntervalInterface
+{
+    /**
+     * Returns initial position.
+     */
+    public function getFrom(): PositionInterface;
+
+    /**
+     * Returns final position.
+     */
+    public function getTo(): PositionInterface;
+
+    /**
+     * Returns delta from initial and final position in bytes.
+     *
+     * @return int<0, max>
+     */
+    public function getLength(): int;
+}
diff --git a/src/PositionFactoryInterface.php b/src/PositionFactoryInterface.php
index 18854ee..f4138b8 100644
--- a/src/PositionFactoryInterface.php
+++ b/src/PositionFactoryInterface.php
@@ -42,7 +42,7 @@ public function createAtEnding(ReadableInterface $source): PositionInterface;
      */
     public function createFromOffset(
         ReadableInterface $source,
-        int $offset = PositionInterface::MIN_OFFSET,
+        int $offset = PositionInterface::MIN_OFFSET
     ): PositionInterface;
 
     /**
@@ -70,6 +70,6 @@ public function createFromOffset(
     public function createFromPosition(
         ReadableInterface $source,
         int $line = PositionInterface::MIN_LINE,
-        int $column = PositionInterface::MIN_COLUMN,
+        int $column = PositionInterface::MIN_COLUMN
     ): PositionInterface;
 }