Hardly important but I hope that in parts of the std lib where they added support for contexts by adding a `FooContext` func for every `Foo` and latter just cal

Hardly important but I hope that in parts of the std lib where they added support for contexts by adding a `FooContext` func for every `Foo` and latter just calls the former with `context.Background()`.. we can just have `Foo` that takes a context argument.