Set accepts params that cause an error in real redis

[ProdigyTom]

We are using redis-mock for our dev environments. I was a bit unfamiliar with how the options worked for the set command and I came up with this:

redis.set(key, value, 'NX', 300);

Which I thought would set the key and expiry time as long as the key didn't already exist. This seems to work with redis-mock just fine. When I moved to the staging environment which uses actual redis I was getting a syntax error from redis. As it turns out what I actually wanted was this:

redis.set(key, value, 'EX', 300, 'NX');

But the issue I see here is that the first call above works in redis-mock but causes a syntax error for real redis. I am using version 0.23.0