D3845: worker: support more return types in posix worker

[yuja (Yuya Nishihara)]

yuja added a comment.


  >   I'm not in love with pickle. Could we use json or cbor instead?
  
  Perhaps cbor is better since it can be streamed and the overhead is pretty
  low. We have to keep the message size small since rfd/wfd is a multi-writer
  pipe.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D3845

To: hooper, #hg-reviewers
Cc: yuja, durin42, mercurial-devel