HSET method not working with flattened hashes

[norbertbakoascenda]

Issue

As the title says:

• Simple Redis (v.4.8.1) is working with flattened hashes
• FakeRedis throws argument error

Proof

[1] pry(main)> hash = {:name=>"job", :namespace=>"default", :klass=>"Job"}
=> {:name=>"job", :namespace=>"default", :klass=>"Job"}
[2] pry(main)> redis = Redis.new
=> #<Redis client v4.8.1 for redis://localhost:6379/15>
[3] pry(main)> redis.hset "flatten_test", hash.flatten
=> 3
[4] pry(main)> redis.hgetall("flatten_test")
=> {"name"=>"job", "namespace"=>"default", "klass"=>"Job"}
[5] pry(main)> require 'fakeredis'
=> true
[6] pry(main)> fake_redis = Redis.new
=> #<Redis client v4.8.1 for redis://localhost:6379/15>
[7] pry(main)> fake_redis.hset "flatten_test", hash.flatten
Redis::CommandError: ERR wrong number of arguments for HMSET