Fix concurrent map writes

[jerbob92]

Fixes #193

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #195   +/-   ##
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  Coverage        ?   75.63%           
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  Files           ?      110           
  Lines           ?    24784           
  Branches        ?        0           
=======================================
  Hits            ?    18746           
  Misses          ?     4257           
  Partials        ?     1781           

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