[9.x] Stringable exactly not match with other Stringable variable (#41846)

* issue-41845 cast string arg on exatcly method on Stringable class when compare two string

* issue-41845 update Stringable class to exactly method match with another Stringable variable

* issue-41845 fix indentation on SupportStringableTest

* issue-41845 fix indentation on Stringable class

* Update Stringable.php

Co-authored-by: Taylor Otwell <[email protected]>

Author: medeiroz

src/Illuminate/Support/Stringable.php

@@ -210,11 +210,15 @@ public function endsWith($needles)
     /**
      * Determine if the string is an exact match with the given value.
      *
-     * @param  string  $value
+     * @param  \Illuminate\Support\Stringable|string  $value
      * @return bool
      */
     public function exactly($value)
     {
+        if ($value instanceof Stringable) {
+            $value = $value->toString();
+        }
+
         return $this->value === $value;
     }
 

tests/Support/SupportStringableTest.php

@@ -999,4 +999,15 @@ public function testGet()
         $this->assertSame('foo', $this->stringable('foo')->value());
         $this->assertSame('foo', $this->stringable('foo')->toString());
     }
+
+    public function testExactly()
+    {
+        $this->assertTrue($this->stringable('foo')->exactly($this->stringable('foo')));
+        $this->assertTrue($this->stringable('foo')->exactly('foo'));
+
+        $this->assertFalse($this->stringable('Foo')->exactly($this->stringable('foo')));
+        $this->assertFalse($this->stringable('Foo')->exactly('foo'));
+        $this->assertFalse($this->stringable('[]')->exactly([]));
+        $this->assertFalse($this->stringable('0')->exactly(0));
+    }
 }