perf: make GetEncoder zero alloc

[abemedia]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.35%. Comparing base (e91b533) to head (0e5d48e).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #269   +/-   ##
=======================================
  Coverage   98.35%   98.35%           
=======================================
  Files          24       24           
  Lines         852      852           
=======================================
  Hits          838      838           
  Misses          9        9           
  Partials        5        5           

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