Reproducing NPE when serializing f1 closure
Do not clean String objects. Enclose code block and reproduced NPE
add assertion
NPE is thrown when code block is defined within for-comprehension. I will fix it
minimize test case
Add  field as serialization target
Add  field for the initial class
Traverse  fields
Revert to the previous recursive serialization
Add putRaw method to save serialization cost
tweak
Merge branch 'feature/closure-serializer' into feature/executor