[Bundles] Add part about resolving parameter values to prepend extension #15048
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I did run into the following issue: symfony/symfony#40198
As when the
$configs
arrray did contain something like%kernel.debug%
it did error with:I did debug how symfony is handling this and it seems they are resolving the parameter before here:
https://github.com/symfony/symfony/blob/252f85c2c249da7d8f2a490b57cc71199d51fcc9/src/Symfony/Component/DependencyInjection/Compiler/MergeExtensionConfigurationPass.php#L54-L62
So I think this should also be part of the Prepend Extension Documentation.