retry_strategy never called after disconnect?

There seems to be an issue with retry_strategy when the client loses the redis connection.

Example:

const redis = redis_lib.createClient({
    "url": "redis://" + config.IP,
    retry_strategy: function (options) {
        console.log("Called");
        return 200;
    }
});

• If the IP is bad, and can never connects to redis, the function is called, and reconnects attempts happen every 200ms as expected.
• If the IP is good, it connects to redis, but after the connection drops, this function is not called, instead some default logic takes place, where the reconnect intervals grows exponentially.
  (ex: 3, 6, 12, etc)

Environment

node --version
v10.21.0

redis-server --version
Redis server v=6.0.5 sha=00000000:0 malloc=jemalloc-5.1.0 bits=64 build=35e65e7214deffbe

lsb_release -a
Distributor ID: Ubuntu
Description: Ubuntu 18.04.3 LTS
Release: 18.04
Codename: bionic

Start by reproducing the two cases described: an unreachable Redis server and a connection that drops after succeeding. Trace how retry_strategy is handled during initial connection versus post-disconnect reconnects, then verify that the configured 200ms behavior is used after a drop and that tests cover both paths.