\XF\Entity\StyleProperty::property_value is type-hinted as array|null with a column type definition of self::JSON.PHP:
Code:
/**
@property array|null $property_value
*/self::JSON_ARRAY is the one which can return array|null. The column definition self::JSON can return string|int|float|bool|array|null or simply mixed, as this results from json_decode/json_encode supports "simple values" as a top-level item.This probably...
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