: () => {
          const expectedType = getType(expected);

          let deepEqualityName = null;
          if (expectedType !== 'map' && expectedType !== 'set') {
            // If deep equality passes when referential identity fails,
            // but exclude map and set until review of their equality logic.
            if (equals(received, expected, toStrictEqualTesters, true)) {
              deepEqualityName = 'toStrictEqual';
            } else if (equals(received, expected, [iterableEquality])) {
              deepEqualityName = 'toEqual';
            }
          }

          return (
            matcherHint(matcherName, undefined, undefined, options) +
            '\n\n' +
            (deepEqualityName !== null
              ? DIM_COLOR(
                  `If it should pass with deep equality, replace "${matcherName}" with "${deepEqualityName}"`,
                ) + '\n\n'
              : '') +
            printDiffOrStringify(
              expected,
              received,
              EXPECTED_LABEL,
              RECEIVED_LABEL,
              isExpand(this.expand),
            )
          );
        };

 : () =>
     matcherHint(matcherName, undefined, undefined, options) +
     '\n\n' +
     printDiffOrStringify(
       expected,
       received,
       EXPECTED_LABEL,
       RECEIVED_LABEL,
       isExpand(this.expand),
     );