fix the hello-world tutorial
add multiple customization test cases. #235
add lots of duration tests. #234
fix duration test value in test_4suite #234
minor
fix most troubles with duration serialization. #234
minor #234
fix tests. #234
fix test values #234
fix losing pattern on re-customization. #235
changelog update
fix binary urlsafe_base64 encoding.
changelog update
Fix typo in arbitrary exception serialization logic.
changelog update
Merge remote-tracking branch 'origin/2_10' into 2_10
version bump