Build strategy of "Single Daily Build" still allows dependent builds although it doesn't say it does.

The options in the build strategy dropdown in a plan's source repository tab are as follows (on my instance)

• Polling the repository for changes
• Repository triggers the build when changes are committed
• Cron based scheduling
• Single Daily Build
• Manual & dependent builds only

I've always interpreted this to mean that dependency builds only occur when you set a build strategy of "Manual & dependent builds only". But it turns out I'm wrong, and at least when Single Daily Build is chosen, builds will actually still occur in response to a parent build. Is that the intended behaviour?

Why does the last option say "& dependent builds" if it always applies? Why doesn't the previous option say "Single daily build & dependent builds"?