If the `ci` options are a set of options rather than a single option,
then the module system cannot lazily override it via `mkForce`.
In practice, this means that the dev partition gets evaluated strictly
when the module system "pushes down" the `ci` definitions to its
options.
Instead, we must ensure that each attribute listed in `partitionedAttrs`
corresponds to an actual option which can be directly defined, with no
"pushing down" required.
Fixes#3532
67785f9577