mirror of https://github.com/astral-sh/uv
## Summary
Previously, when we encountered `foo[bar]`, we'd add a dependency on
`PubGrubPackage::Package` for `foo`, and then `PubGrubPackage::Extra`
for `foo[bar]`.
Later, when we ask for the dependencies of the `PubGrubPackage::Extra`,
we add `PubGrubPackage::Package` for `foo`, and
`PubGrubPackage::Package` for `foo[bar]`. This is an intentional
strategy because it ensures that PubGrub "knows" that these have to be
solved to the same version as early as possible.
It turns out that the first part here ("add a dependency on
`PubGrubPackage::Package` for `foo`") is suboptimal, because it means
PubGrub might try to solve _just_ `foo` without realizing that it also
has to accommodate all the constraints from the extra.
Instead, we now add _just_ `PubGrubPackage::Extra` for `foo[bar]`, and
defer adding the base package. It looks like this leads to a far more
efficient solve for Airflow.
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