The characteristics of a list are
o the order of the entries is significant
o duplicates are allowed
The characteristics of a set are
o the order is not significant
o duplicates are not allowed.
When describing keys for a step the characteristics of a
set applies here, whereas the characteristics of a list does
not apply.
Caused by the missing nonCps annotation the unflatted configuration
tree of all the default values was returned.
After adding the nonCps annotation we get only the default for
either stages or steps and only for the required step/stage.
The methods a related to an outdated use case
It was intended for getting the coordinates of a payload repo when the
pipeline repo is specified in the pipeline job.
That has been changed so that the pipeline (or at least a stub pipeline)
is now always contained in the payload repo and the payload repo is
always specified in the pipeline job itself.
