Bug report

If we set the existing list key, the array still be a list, but phpstan thinks that it is not true.

if (isset($this->list[$offset])) {
	$this->list[$offset] = 123; 
	// `$this->list` still a list
}

Code snippet that reproduces the problem

https://phpstan.org/r/32e2baf1-42ba-4494-9500-13459f0d33b7

Expected output

No error.

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