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The C++ wrapper makes heavy use of templates to support arbitrary types in the platform channel classes, but in practice EncodableValue is what essentially all code will use. This defaults those template types to reduce boilerplate in plugin code (e.g., allowing the use of MethodChannel<> instead of MethodChannel<EncodableValue>).
This code is intended to be built into plugins and applications to provide higher-level, C++ abstractions for interacting with the Flutter library. Over time, the goal is to move more of this code into the library in a way that provides a usable ABI (e.g., does not use standard library in the interfaces). Note that this wrapper is still in early stages. Expect significant churn in both the APIs and the structure of the wrapper (e.g., the exact set of files that need to be built).