2.1.1
Released: September 25, 2026
platform
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[platform] [bug] Removed the legacy underscore-separated extra names such as
mssql_pymssqlandpostgresql_psycopgfrompyproject.toml. They normalize to the same names as the existing dash-separated extras, which is disallowed by PEP 685, and caused the 2.1.0 source distribution to fail to build with installers that enforce this rule, such as uv. The underscore spellings continue to work when installing, as installers normalize extra names before matching them.References: #13604