Group interface

Author: WyriHaximus

src/GroupInterface.php

@@ -0,0 +1,8 @@
+<?php declare(strict_types=1);
+
+namespace WyriHaximus\React\Parallel;
+
+interface GroupInterface
+{
+    public function __toString(): string;
+}

src/LowLevelPoolInterface.php

@@ -4,7 +4,7 @@
 
 interface LowLevelPoolInterface extends PoolInterface
 {
-    public function acquireGroup(): Group;
+    public function acquireGroup(): GroupInterface;
 
-    public function releaseGroup(Group $group): void;
+    public function releaseGroup(GroupInterface $group): void;
 }