Small performance improvement based on what was slow in the benchmark

• adds: avoid creating an empty dict
• expire: add some missing types to avoid some checks

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.78%. Comparing base (854fef6) to head (e7efb1a).
Report is 1 commits behind head on master.

@@           Coverage Diff           @@
##           master    #1490   +/-   ##
=======================================
  Coverage   99.78%   99.78%           
=======================================
  Files          30       30           
  Lines        3311     3316    +5     
  Branches      453      455    +2     
=======================================
+ Hits         3304     3309    +5     
  Misses          5        5           
  Partials        2        2           

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CodSpeed Performance Report

Merging #1490 will improve performances by 8.19%

_{Comparing speed_up_adding_records_to_cache (e7efb1a) with master (854fef6)}

Summary

⚡ 1 improvements
✅ 5 untouched benchmarks

Benchmarks breakdown