Code Duplication    Length = 4-4 lines in 2 locations

src/Serializer.php 2 locations

@@ 109-112 (lines=4) @@
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                $relationship = [];
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                if (is_array($items)) {
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                    foreach ($items as $item) {
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                        if ($item instanceof ResourceIdentifierInterface) {
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                            $this->checkIdentification($item);
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                            $relationship[] = ['id' => $item->getId(), 'type' => $item->getType()];
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                        }
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                    }
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                } elseif ($items instanceof ResourceIdentifierInterface) {
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                    $this->checkIdentification($items);
@@ 114-117 (lines=4) @@
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                            $relationship[] = ['id' => $item->getId(), 'type' => $item->getType()];
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                        }
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                    }
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                } elseif ($items instanceof ResourceIdentifierInterface) {
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                    $this->checkIdentification($items);
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                    $relationship = ['id' => $items->getId(), 'type' => $items->getType()];
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                }
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                if (!empty($relationship)) {
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                    $data['relationships'][$name]['data'] = $relationship;