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Don't perform
coro::generator
/coro::async_generator
transformation at package build time; if we do so, we're basically hardcoding the coro transformation into that built package, which might be a problem if coro is then upgraded.We take two approaches to this:
rlang::on_load
to defer their definition until package.onLoad
.generator_method
/async_generator_method
decorators and make them even more complicated, by having them defer the coro transformation until the first time they are invoked.