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+## Deprecate `build_always`
+
+Setting `build_always` to `true` for a custom target not only marks the target
+to be always considered out of date, but also adds it to the set of default
+targets. This option is therefore deprecated and the new option
+`build_always_stale` is introduced.
+
+`build_always_stale` *only* marks the target to be always considered out of
+date, but does not add it to the set of default targets. The old behaviour can
+be achieved by combining `build_always_stale` with `build_by_default`.
+
+The documentation has been updated accordingly.