Bug report

even though we know the types of curl constants like e.g. CURLOPT_CUSTOMREQUEST we don't error about invalid values passed into them via curl_setopt_array

Code snippet that reproduces the problem

https://phpstan.org/r/5a37e3ac-354d-49cb-93d8-e9079863c140

Expected output

a error that you cannot pass a non-backed enum into a curl option which expects a string or null

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