Fix phpstan issues

.phpstan/baseline.neon

@@ -1,10 +1,5 @@
 parameters:
 	ignoreErrors:
-		-
-			message: "#^Call to function is_string\\(\\) with stdClass will always evaluate to false\\.$#"
-			count: 2
-			path: ../src/Bigcommerce/Api/Client.php
-
 		-
 			message: "#^Method Bigcommerce\\\\Api\\\\Client\\:\\:createCoupon\\(\\) has parameter \\$object with no type specified\\.$#"
 			count: 1
@@ -500,11 +495,6 @@ parameters:
 			count: 1
 			path: ../src/Bigcommerce/Api/Filter.php
 
-		-
-			message: "#^Method Bigcommerce\\\\Api\\\\Filter\\:\\:__set\\(\\) has no return type specified\\.$#"
-			count: 1
-			path: ../src/Bigcommerce/Api/Filter.php
-
 		-
 			message: "#^Method Bigcommerce\\\\Api\\\\Filter\\:\\:__set\\(\\) has parameter \\$parameter with no type specified\\.$#"
 			count: 1

src/Bigcommerce/Api/Client.php

@@ -398,8 +398,8 @@ private static function mapCollectionObject($object)
      * Map a single object to a resource class.
      *
      * @param string $resource name of the resource class
-     * @param \stdClass $object
-     * @return Resource
+     * @param \stdClass|boolean|string $object
+     * @return bool|\stdClass|string
      */
     private static function mapResource($resource, $object)
     {
@@ -415,8 +415,8 @@ private static function mapResource($resource, $object)
     /**
      * Map object representing a count to an integer value.
      *
-     * @param \stdClass $object
-     * @return int
+     * @param \stdClass|boolean|string $object
+     * @return int|boolean
      */
     private static function mapCount($object)
     {