Register 0.4.0

[adolgert]

@JuliaRegistrator register

Release notes:

There are no breaking changes. This version fixes a type stability error so it should be faster.

[JuliaRegistrator]

Registration pull request updated: JuliaRegistries/General/128533

Tagging

After the above pull request is merged, it is recommended that a tag is created on this repository for the registered package version.

This will be done automatically if the Julia TagBot GitHub Action is installed, or can be done manually through the github interface, or via:

git tag -a v0.4.0 -m "<description of version>" da51867f285e671ccc9dc1b67d7beb9bdefacad8
git push origin v0.4.0