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[php] make ObjectSerializer::toString actually return a string

Merged Administrator requested to merge github/fork/fengelniederhammer/php-tostring into master

Created by: fengelniederhammer

Problem

In our project, we use a CS tool that adds declare(strict_types=1) everywhere. ObjectSerializer::toPathValue then throws a type error, if you for example have a field in your API that is an integer, as rawurlencode only accepts strings.

Proposed Solution

Make ObjectSerializer::toString actually return a string:

  • Less surprises due to inconsistent types
  • The function does what it promises

@jebentier , @dkarlovi, @mandrean, @jfastnacht, @ybelenko, @renepardon