gcache:add callback func before data expired when remove it

[tianyixueshi]

Is your feature request related to a problem?

Option Yes

Describe the solution you'd like

I use gcache stroe a struct contains a chan for special web session used. when struct expired, i cannt close then chann before it removed.
so , can add a callback func when removed it

Describe alternatives you've considered

when set a cache, can add a optional call fun

Additional

No response

[yzy613]

This is not recommended because gcache is designed as an interface. If this interface is opened, can the same operation be applied to redis?