No need to del elem when config.CleanWindow>0 at method:Set

[zhangyaping-CN]

No description provided.

[cristaloleg]

SGTM, maybe a test?

[cristaloleg]

SGTM

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 40.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 87.50%. Comparing base (7c2932e) to head (3a94d94).

Files with missing lines	Patch %	Lines
shard.go	40.00%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #325      +/-   ##
==========================================
- Coverage   88.73%   87.50%   -1.24%     
==========================================
  Files          15       15              
  Lines         772      776       +4     
==========================================
- Hits          685      679       -6     
- Misses         73       80       +7     
- Partials       14       17       +3     

Files with missing lines	Coverage Δ
shard.go	84.16% <40.00%> (-3.68%)	⬇️

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