extract method to wrapProperty as constraint property
do not set the value before updating downstream... set value is called before recalculate
make sure we get a true set solvers
add method to test if something is a valueclass (points for now)
update part-wise for value classes
with value objects, this test is actually broken
test update
fix another test
Merge branch 'master' of https://github.com/babelsberg/babelsberg-js