[patch] remove interface reflection cast from atomic expire variable

[kpango]

No description provided.

[codecov]

Codecov Report

Merging #12 into master will decrease coverage by 0.6%.
The diff coverage is 12.5%.

@@            Coverage Diff            @@
##           master     #12      +/-   ##
=========================================
- Coverage   10.81%   10.2%   -0.61%     
=========================================
  Files           1       1              
  Lines         148     147       -1     
=========================================
- Hits           16      15       -1     
  Misses        132     132

Impacted Files	Coverage Δ
gache.go	10.2% <12.5%> (-0.61%)	⬇️

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