wrong type specified in group_by
wrong type for seed in scan
ensure that maybe type is decayed
a loop must prevent moves.
update tests to use on.next instead of on.on_next
update new retry tests
Merge pull request #34 from kirkshoop/cppnow

add retry tests, bug fixes, rename on.on_next to on.next in tests
allow conversions to dynamic
Merge pull request #35 from kirkshoop/cppcon

allow conversions to dynamic
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