If framework.messenger.buses.X.middleware
is empty, it will be null
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@ -1090,7 +1090,7 @@ class Configuration implements ConfigurationInterface
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->end()
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->arrayNode('middleware')
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->beforeNormalization()
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->ifTrue(function ($v) { return \is_string($v) || !\is_int(key($v)); })
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->ifTrue(function ($v) { return \is_string($v) || (\is_array($v) && !\is_int(key($v))); })
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->then(function ($v) { return array($v); })
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->end()
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->defaultValue(array())
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