SDIFF not returning correct response

[kylefarris]

If I add values to 2 different sets via SADD and then try to diff them using the SDIFF method, the wrong result is returned. But, if I run sendCommand(['SDIFF', 'key1', 'key2']) it returns the correct result.

For Example:

import redis from 'redis';

const client = redis.createClient();
await client.connect();

const array1 = ['a', 'b', 'c', 'd', 'e', 'f', 'g'];
const array2 = ['d', 'c', 'f', 'a'];

await client.SADD('key1', array1);
await client.SADD('key2', array2);

const badDiff = await client.SDIFF('key1', 'key2');
console.log('Bad Diff: ', badDiff);
// Bad Diff: [ 'g', 'a', 'd', 'c', 'f', 'b', 'e' ] (Incorrect!)

const goodDiff = await client.sendCommand(['SDIFF', 'key1', 'key2']);
console.log('Good Diff: ', goodDiff);
// Good Diff: [ 'g', 'b', 'e' ] (Correct!)

It doesn't make a lot of sense why this would be happening but its easily verifiable.

Environment:

• Node.js Version: 18.7.0
• Redis Server Version: 7.0.4
• Node Redis Version: 4.3.1
• Platform: MacOS 12.5.1 & AlmaLinux 8.6