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Ruslan Zakirov authored
A value for Sign or Encrypt of undef is an indication of "do whatever the queue's options say." d3341b78 resolved a bug of inserting array references into X-RT-Sign, but in doing so lost the possibility to pass undef into ProcessUpdateMessage, and have the queue default kick in. In practice, this is only relevant if the signing controls were not submitted, but customizations may do so.
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