improve merging of resolve and parsing options #9422
Merged
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by rules and via loader API
Arrays overwrite by default, but can reference old value with "..."
partial backport of #9126
What kind of change does this PR introduce?
feature
Did you add tests for your changes?
yes
Does this PR introduce a breaking change?
no
What needs to be documented once your changes are merged?
Merging of Rule.resolve/Rule.parser objects has a new feature:
In array the special "..." item can now be used to reference to old value, while otherwise array values overwrite each other.
This also affects the getResolve(options) API in the loader API