type IntervalIndex

[MarcoGorelli]

The only untyped method here is get_indexer, which can just inherit from the parent definition, there's nothing interval-index-specific about it

• Closes #xxxx (Replace xxxx with the Github issue number)
• Tests added: Please use assert_type() to assert the type of any return value

[cmp0xff]

In pyproject.toml, could you replace

"*index*" = [
  # TODO: remove when indexes are fully typed
  "ANN001", "ANN201", "ANN204", "ANN206",
]

with

"indexers.pyi" = [
  # TODO: remove when indexers.pyi is fully typed
  "ANN001", "ANN201", "ANN204", "ANN206",
]
"multi.pyi" = [
  # TODO: remove when multi.pyi is fully typed
  "ANN001", "ANN201", "ANN204", "ANN206",
]
"indexing.pyi" = [
  # TODO: remove when indexing.pyi is fully typed
  "ANN001", "ANN201", "ANN204", "ANN206",
]

?

[cmp0xff]

Thank you @MarcoGorelli !