Bug report

We are having problems adding a string with an ampersand as a text element to a SimpleXMLElement node using addChild. Researching, I found https://stackoverflow.com/questions/2970575/php-simplexmlelement-set-text and applied its solution. It absolutely solves our problem. However, Phpstan complains "SimpleXMLElement does not accept string."

Code snippet that reproduces the problem

https://phpstan.org/r/79d3daf7-1686-4da3-abcd-b1329578af0c

Expected output

Phpstan should report no errors.

I believe Phpstan should not be reporting an error for assigning a string to element [0] of a simpleXMLElement. FWIW, https://onlinephp.io/c/d98a5 demonstrates that the code works correctly in all relevant Php versions.

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