The main difference between BUILD and TWEAK is that BUILD will replace
all default and requiredness handling, while TWEAK keeps it intact.
TWEAK gets run after these aspects had their turn, so if you have an "is
required" attribute that doesn't get a value passed, the BUILDALL
process will throw the corresponding exception before TWEAK even gets

Don't forget that with the assignment syntax for attribute defaults
you're allowed to do calculations, too! You can even refer to other
attributes in there, as long as you use the $!foo syntax.

hope that helps
  - Timo

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