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[DI] Deprecate case insentivity of service identifiers #21193

@nicolas-grekas

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@nicolas-grekas
Q A
RFC? yes
Symfony version 3.3

Case insensitivity blocks some optimizations in the dumped container, slows down getting some services (especially now that we're going to use class names as ids) and adds code complexity.
We'd better make them case sensitive in 4.0, thus deprecate before.

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