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:octocat: mark nullable types explicitly (https://github.com/chillerlan/php-qrcode/issues/276)
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@@ -30,7 +30,7 @@ class QRImageWithLogo extends QRGdImagePNG{
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* @return string
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* @throws \chillerlan\QRCode\Output\QRCodeOutputException
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*/
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public function dump(string $file = null, string $logo = null):string{
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public function dump(string|null $file = null, string|null $logo = null):string{
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// set returnResource to true to skip further processing for now
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$this->options->returnResource = true;
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