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Implements return types on aggregators
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@@ -60,7 +60,7 @@ class MonthYearAggregator implements AggregatorInterface
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return [];
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}
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public function getLabels($key, array $values, $data): \Closure
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public function getLabels($key, array $values, $data): callable
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{
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return static function ($value): string {
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if ('_header' === $value) {
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