Bugfixes 🐛

• Subclasses of PDO are analysed using static reflection (phpstan/phpstan-src@8390949), #3527
• Fix problems related to conditional declarations of classes - #3522
• Dive into a trait that starts on the same line as the one in the reflection (phpstan/phpstan-src@e6dd87b), #3460

Function signature fixes 🤖

• ZipArchive::open() returns true on success, int (error code) on failure (#253), thanks @dktapps!
• mysqli_stmt_fetch() and mysqli_stmt::fetch() can return NULL (#255), thanks @morozov!
• openssl_pkey_export() allows null for the passphrase (#256), thanks @ConradSollitt!
• Fix enchant_broker_list_dicts() return type (#257), #3530, thanks @villfa!
• correct return value for PHP internal functions on failure (#258), thanks @peter-gribanov!
• Fix return type & callback type hints for Redis::subscribe() (#259), thanks @hollodotme!