codespell has issues when pyproject.toml includes multiple sections of [[tool.uv.index]] #3852

Issue

codespell fails to parse pyproject.toml with TOML array of tables syntax [[...]] (e.g. multiple sections of [[tool.uv.index]]) and throws an error indicating the section "already exists".

Using latest codespell release 2.4.1.

Steps to Reproduce

1. Create a pyproject.toml with multiple entries using TOML array of tables syntax, for example:

[[tool.uv.index]]
name = "custom-index"
url = "https://example.com/simple/"
explicit = true

[[tool.uv.index]]
name = "pypi"
url = "https://pypi.org/simple"

2. Run codespell

Expected Behavior

codespell should correctly parse the TOML array of tables syntax [[...]] as defined in the [TOML specification]. Multiple [[section]] entries are valid TOML and represent an array of tables.

This syntax is commonly used by modern Python tooling like [uv] for defining multiple package indexes. The TOML file is valid and works correctly with other tools (uv, pip, ruff, etc.).