[DependencyInjection] Document Container invalid behavior #17903
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Try fix #8759
Explanations come from repository
https://github.com/symfony/symfony/blob/8cf5f021fae00975c67a3a50806edbef8bab973b/src/Symfony/Component/DependencyInjection/Container.php#L34-L44
(I will make a PR on symfony to document
RUNTIME_EXCEPTION_ON_INVALID_REFERENCE
when I will unterstand it)