Fix trailing task precompilation issue on 1.9. Run CI on 1.9 #1201
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Fixes #1202
See #1195 (comment)
#1200 shows that without this, things go bad on 1.9
The print that it was causing is weird.. just seems to show a task object..
But it seems to be something like 1.9 not yielding for tasks to exit before serialization, so do it explicitly.