Unlike other Objective-C objects, there's no hard reason why the compiler wouldn't be able to initialize a block statically (as it does with NSString literals). And it certainly doesn't complain about it (like it does with other object initializers). But as I haven't been able to find confirmation of this, and we're seeing a weird crash occur near this code, let's play it safe.
This is a generic Reactive Extensions library for Objective-C, created to ease the implementation of the gRPC Objective-C runtime.
It has no dependencies on gRPC nor other libraries, and should eventually be moved under its own GitHub project.
If you're trying to get started on the library, you might want to first read GRXWriter.h and then GRXWriteable.h.