In the nested_attributes plugin, initialize the parent association in a new child when the reciprocal association exists.
Minor modifications to nested_attributes reciprocal commit

Use add_reciprocal_object to set up the reciprocal, which means
that it will be setup only for reciprocal singular associations,
since other associations won't have a cached association array.

It's possible in the future that this can be extended to support
reciprocal plural associations, but I'm not sure what the corner
cases are in that case.
Fix eager loading limited associations via a UNION when an association block is used

This actually fixes a regression that first occurred in 4.10.0.
However, since 4.11.0 has already been released, there won't
be a new gem issued. Sequel's policy is to issue a new gem for
regression fixes if the regression first occurred in the latest
release.