Returns a copy of fields without the excluded keys, or the ORIGINAL object when
no key matches (so the no-exclusions path allocates nothing). Matching is exact:
source field names are the connector's own spelling, already used verbatim as
field-map SourceFieldName and overflow keys.
Returns a copy of
fieldswithout the excluded keys, or the ORIGINAL object when no key matches (so the no-exclusions path allocates nothing). Matching is exact: source field names are the connector's own spelling, already used verbatim as field-map SourceFieldName and overflow keys.