fix: Query builder escapes negative integers

Fixes #4973

Author: kenjis

system/Database/BaseConnection.php

@@ -1201,7 +1201,7 @@ public function escape($str)
         }
 
         if (is_numeric($str) && $str < 0) {
-            return "'{$str}'";
+            return "{$str}";
         }
 
         return $str ?? 'NULL';

tests/system/Database/BaseQueryTest.php

@@ -345,6 +345,24 @@ public function testSetQueryBindsWithSetEscapeFalse()
         $this->assertSame($expected, $query->getQuery());
     }
 
+    /**
+     * @see https://github.com/codeigniter4/CodeIgniter4/issues/4973
+     */
+    public function testSetQueryBindsWithSetEscapeNegativeIntegers()
+    {
+        $query = new Query($this->db);
+
+        $query->setQuery(
+            'SELECT * FROM product WHERE date_pickup < DateAdd(month, ?, Convert(date, GetDate())',
+            [-6],
+            true
+        );
+
+        $expected = 'SELECT * FROM product WHERE date_pickup < DateAdd(month, -6, Convert(date, GetDate())';
+
+        $this->assertSame($expected, $query->getQuery());
+    }
+
     /**
      * @see https://github.com/codeigniter4/CodeIgniter4/issues/2762
      */

tests/system/Database/Live/EscapeTest.php

@@ -40,7 +40,7 @@ protected function setUp(): void
      */
     public function testEscapeProtectsNegativeNumbers()
     {
-        $this->assertSame("'-100'", $this->db->escape(-100));
+        $this->assertSame('-100', $this->db->escape(-100));
     }
 
     public function testEscape()