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This is a PR to:
* Add `contextlib.aclosing` which ia analogous to `contextlib.closing` but for async-generators with an explicit test case for [bpo-41229]()
* Update the docs to describe when we need explicit `aclose()` invocation.
which are motivated by the following issues, articles, and examples:
* [bpo-41229]()
* https://github.com/njsmith/async_generator
* https://vorpus.org/blog/some-thoughts-on-asynchronous-api-design-in-a-post-asyncawait-world/#cleanup-in-generators-and-async-generators
* https://www.python.org/dev/peps/pep-0533/
*
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| .. | ||
| compound_stmts.rst | ||
| datamodel.rst | ||
| executionmodel.rst | ||
| expressions.rst | ||
| grammar.rst | ||
| import.rst | ||
| index.rst | ||
| introduction.rst | ||
| lexical_analysis.rst | ||
| simple_stmts.rst | ||
| toplevel_components.rst | ||