hardcoding encoder option for lcsIdx

Signed-off-by: TJ Zhang <tj.zhang@improving.com>

node/src/BaseClient.ts

@@ -6304,7 +6304,6 @@ export class BaseClient {
      * @param options - (Optional) Additional parameters:
      * - (Optional) `withMatchLen`: if `true`, include the length of the substring matched for the each match.
      * - (Optional) `minMatchLen`: the minimum length of matches to include in the result.
-     * - (Optional) `decoder`: see {@link DecoderOption}.
      * @returns A `Record` containing the indices of the longest common subsequences between the
      *     2 strings and the lengths of the longest common subsequences. The resulting map contains two
      *     keys, "matches" and "len":
@@ -6345,12 +6344,11 @@ export class BaseClient {
         options?: {
             withMatchLen?: boolean;
             minMatchLen?: number;
-        } & DecoderOption,
+        },
     ): Promise<Record<string, (number | [number, number])[][] | number>> {
-        // TODO: convert Record return type to Object array
         return this.createWritePromise(
             createLCS(key1, key2, { idx: options ?? {} }),
-            options,
+            { decoder: Decoder.String },
         );
     }