It seems like abs($this->value - $value->get()) can also be of type double; however, parameter $value of AardsGerds\Game\Shared\IntegerValue::__construct() does only seem to accept integer, maybe add an additional type check?
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Ignorable by Annotation
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If this is a false-positive, you can also ignore this issue in your code via the ignore-type annotation
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return new static(/** @scrutinizer ignore-type */ abs($this->value - $value->get()));