Fix #9364: autodoc: 1-element tuple on the defarg is wrongly rendered
PR #9367 ↗ · sphinx-doc/sphinx · · merged Jun 30, 2021 · +9−4 · base 6918e6960081
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1-element tuple rendered incorrectly
**Describe the bug**
This is a followup to #7964 which has been addressed in #8265.
However the special case of a 1-element tuple is still not handled correctly.
`(1,)` is rendered as `(1)`, but should keep the trailing comma.
**To Reproduce**
Add a testcase
```
("(1,)", "(1,)"), # Tuple (single element)
```
at https://github.com/sphinx-doc/sphinx/blob/e0b1e1002b500acc63dfd0806f8095dd6b27037b/tests/test_pycode_ast.py#L57
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