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We've occasionally received bug reports related to users having objects that redefine `send` (e.g. `Email#send`), and using `__send__` is best to avoid those problems. Many of the receivers of `__send__` here are objects we own and that do not (and never will) redefine `send`; however, for consistency, it's good to standardize on `__send__`. That way, we're less likely to forget it in the future for a case where it does matter.
Before, they were not exposed globally if the config option was already set.