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buildstream 1.2.3
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o Fixed an unhandled exception when cleaning up a build sandbox (#153)
o Fixed race condition when calculating cache size and commiting artifacts
o Fixed regression where terminating with `^C` results in a double user interrogation (#693)
o Fixed regression in summary when builds are terminated (#479)
o Fixed regression where irrelevant status messages appear from git sources
o Improve performance of artifact uploads by batching file transfers (#676/#677)
o Fixed performance of artifact downloads by batching file transfers (#554)
o Fixed checks for paths which escape the project directory (#673)
