`Perfdata`: Fix return type for method `convert()`
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@ -353,7 +353,7 @@ class Perfdata
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* @param string $value The value to convert
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* @param string $fromUnit The unit the value currently represents
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*
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* @return null|float Null in case the value is not a number
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* @return ThresholdRange|null|float Null in case the value is not a number
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*/
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protected static function convert($value, $fromUnit = null)
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{
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