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:octocat: mark nullable types explicitly (https://github.com/chillerlan/php-qrcode/issues/276)
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@@ -49,7 +49,7 @@ class SVGConvert extends QRMarkupSVG{
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}
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/** @inheritDoc */
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public function dump(string $file = null):string{
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public function dump(?string $file = null):string{
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$base64 = $this->options->outputBase64;
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// we don't want the SVG in base64
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$this->options->outputBase64 = false;
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