release sets negative slots #70
Description
When all slots are released, negative slots are created, allowing you to reserve slots that are more than available. Is this to be expected, or should we restrict releasing slot once all slots have been released?
3.1.0 :001 > slots = Kredis.slots "myslots", available: 3
Kredis (2.0ms) Connected to shared
=>
#<Kredis::Types::Slots:0x0000000114b5eb58
...
3.1.0 :002 > slots.get
Kredis Proxy (1.8ms) GET myslots
=> nil
3.1.0 :003 > slots.available
=> 3
3.1.0 :004 > slots.reserve
Kredis Proxy (0.5ms) INCR myslots
=> true
3.1.0 :005 > slots.get
Kredis Proxy (0.4ms) GET myslots
=> "1"
3.1.0 :006 > slots.available
=> 3
3.1.0 :007 > slots.release
Kredis Proxy (0.3ms) DECR myslots
=> 0
3.1.0 :008 > slots.get
Kredis Proxy (0.4ms) GET myslots
=> "0"
3.1.0 :009 > slots.release
Kredis Proxy (0.4ms) DECR myslots
=> -1
3.1.0 :010 > slots.get
Kredis Proxy (0.5ms) GET myslots
=> "-1"
3.1.0 :011 > slots.available
=> 3
3.1.0 :012 > slots.release
Kredis Proxy (0.5ms) DECR myslots
=> -2
3.1.0 :013 > slots.available
=> 3
3.1.0 :014 > slots.reserve
Kredis Proxy (0.4ms) INCR myslots
=> true
3.1.0 :015 > slots.get
Kredis Proxy (0.3ms) GET myslots
=> "-1"