Description:
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while i *fully* support the intention it's a no-go that automated tests running with 7.2-7.4 don't throw any warning or notice and 8.0 leads to an exception

that will be a bresking change in production instead while running 7.4 over months you just add (string) in front and you are done (example: value is coming from a database instead a form-submit and so is 'int' instead 'string' which is they case here)

TypeError: str_replace(): Argument #2 ($replace) must be of type array|string, int given