Inconsistencies between parameter number and index when reflecting a method/function

Hi All, I've been working on a PR that introduces ReflectionFunctionAbstract::getParameter() and ReflectionFunctionAbstract::hasParameter(), to fall more inline with the other method sets we have, as well as just generally making peoples lives easier. The PR is here: https://github.com/php/php-src/pull/10431 These methods accept an integer to retrieve a parameter by its position, or a string to retrieve by its name. So far, I have built this so that if you required the first parameter, it's parameter 0. I treat it this way because the only other place where we deal with parameter indexes, is ReflectionFunctionAbstract::getParameters() which returns the parameters zero-indexed. The question that is holding this PR back is should these methods be 1 indexed, so that the provided position is consistent with the error messages, or how a person would typically count, or should they be 0 indexed to remain consistent with the existing API. Girgias has asked that I pause the PR until we can have a discussion on this mailing list about how to approach it, so I'm looking for feedback on this. --- Best Regards, *Ollie Read*