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Converted odd SIGNIL type that wouldn't work with syscall type assertion and allow for differentiating between it and an error into SIGNULL,
syscall.Signal(0)
. SIGNULL works here as it allows for the type assertion to work and for a test to skip the signal when found. It is safe as it already exists in practice in a similar role with the POSIXkill
command where it indidates no signal.Fixes #1428
Fixes #1442