Bug fix: concurrent map writes (#15)

[zhyee]

• It may lead to a concurrent map writes fatal error after the deadline reached.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.28%. Comparing base (1d781d2) to head (5a92f27).
Report is 15 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #69      +/-   ##
==========================================
- Coverage   95.27%   94.28%   -0.99%     
==========================================
  Files           4        4              
  Lines         127      105      -22     
==========================================
- Hits          121       99      -22     
  Misses          4        4              
  Partials        2        2              

Flag	Coverage Δ
go-1.18	?
go-1.20	94.28% <100.00%> (?)
go-1.21	90.47% <100.00%> (-4.80%)	⬇️
go-1.22	92.38% <100.00%> (?)
ubuntu-latest	94.28% <100.00%> (-0.99%)	⬇️

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[zhyee]

Fix #15

[demouth]

It seems like a good idea, but I think it's the same fix as #55.

[appleboy]

duplicated of #55