An index key attribute's declared value with dyna-record's brands removed.
LibraryBrandToValue strips the brands that mark a value's role;
PartitionKey and SortKey mark the attribute's role instead, and a caller
writes a plain string for both, so they are stripped here as well.
An index key attribute's declared value with dyna-record's brands removed.
LibraryBrandToValue strips the brands that mark a value's role;
PartitionKeyandSortKeymark the attribute's role instead, and a caller writes a plain string for both, so they are stripped here as well.