fix: zero value for opration

Author: parsgit

src/Process.php

@@ -68,7 +68,7 @@ protected function fix_column_name($name){
   }
 
   protected function fix_operator_and_value(&$operator, &$value){
-    if($value == false || $value == null){
+    if($value === false || $value === null){
       $value = $operator;
       $operator = '=';
     }

tests/SelectTest.php

@@ -157,4 +157,9 @@ public function testEach()
 
       $this->assertSame( 6 , $index);
    }
+
+   public function testSelectAmount(){
+      $count = DB::table('books')->where('amount', '>', 0)->count();
+      $this->assertEquals($count, 3);
+   }
 }