Variable property access on SimpleXMLElement

[ghispi]

Bug report

I'm not sure if this is bug or intended behavior but since SimpleXMLElement has special treatment as an Universal object crates, this should be handled as well, as there is no other way to access nodes having hyphen or other prohibited character.

As per https://www.php.net/manual/en/simplexml.examples-basic.php, example 3

Accessing elements within an XML document that contain characters not permitted under PHP's naming convention (e.g. the hyphen) can be accomplished by encapsulating the element name within braces and the apostrophe.

Code snippet that reproduces the problem

https://phpstan.org/r/93b6f5e2-cddb-4172-b42b-5017d0911fc4

Expected output

No error

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