Fix #247: coroutine support

[jpic]

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[jpic]

@googlebot I signed it!

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[jpic]

Is this going to be released ?

Thank you

[dbieber]

Started adding support for coroutines with e4cb72a.

Can you comment on if this is still necessary or if e4cb72a covers your use-case?

[dbieber]

Closing - feel free to comment and we can reopen if still necessary.