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Both OpenFGA and SpiceDB are also implemented in Go, so they could also easily be included as a library. SpiceDB can even be compiled to WASM!

Not having to tied them together into a single process space is an interesting option/ability which would get lost with using it as a library.

Having the authorizer integrate based on contract feels like an option which allows for more freedom of choice and variety of implementations.

I do not believe in one size fits all, nor that there is one to rule them all.