Add motivation to "Augmentations" about code generation and FFI. #4533
+20
−5
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We usually think of augmentations as being generated code augmenting hand-authored code. But there are use cases in the other direction as well where the code generator produces the base declaration and a user hand-writes an augmentation to tweak it.
Add some verbiage to the motivation section to capture that. There's no normative change in this PR, it's just context.
cc @brianquinlan @devoncarew