Fix bug: When call method `zadd(name, value, score)` and value is integer, it will lead to raise TypeError zadd() keywords must be strings.
Fix bug: When call method `zadd(name, value, score)` and value is integer, it will lead to raise TypeError zadd() keywords must be strings.

ze-phyr-us/fakeredis,OnBeep/fakeredis,fatelei/fakeredis,Tinche/fakeredis