These settings and their usefulness can be (and have been, from what I've seen in multiple issues) easily misunderstood.

For example, the following configurations are equivalent:

[tool.ruff.lint]
# Configuration 1.
select = ["ALL"] 
extend-select = ["D213"]
extend-ignore = ["D212"]

# Configuration 2.
select = ["ALL", "D213"] 
ignore = ["D212"]

[tool.ruff.lint.pydocstyle]
convention = "google"

On the other hand, it seems that lint.extend-ignore was mistakenly deprecated, and it is confusing to see that lint.extend-ignore is deprecated while lint.extend-select is not.

The documentation should include clear use cases for when these settings are useful. From what I understand, these settings are primarily valuable when:

• Using the top-level extend setting to inherit from base configurations.
• Adding rules on top of the default rule set without completely overriding it.