What is the reason for the Swift compiler's inability to deduce generic type in the presence of an opaque type returned in adherence to the `Sequence` protocol?

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The Swift compiler's inability to deduce generic type in the presence of an opaque type returned in adherence to the Sequence protocol is due to the fact that opaque types intentionally hide their underlying type, making it impossible for the compiler to infer the type at compile-time. This is by design, as opaque types are often used to hide implementation details and provide a stable API. As a result, it is necessary to specify the generic type explicitly when working with opaque types that conform to the Sequence protocol.