Raise an error on invalid keys in configuration #2125
Merged
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Previously, unexpected keys in a configuration source were silently
ignored. This led to invalid configuration values (e.g., due to
configuration format updates or due to typos) being silently ignored.
This addition ensures we raise an error on unexpected keys in
configuration sources.
This was spun out of ongoing work on #2121.
make fmt-fix
(or had formatting run automatically on all files edited)./unreleased/
for any new functionality