fix: possible oom when encode parallel in go1.16

[liuq19]

Fix issue #634

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 71.60%. Comparing base (99f5b35) to head (c485a29). Report is 8 commits behind head on main.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #635 +/- ## ========================================== - Coverage 77.56% 71.60% -5.96% ========================================== Files 83 123 +40 Lines 11542 8126 -3416 ========================================== - Hits 8952 5819 -3133 + Misses 2192 1988 -204 + Partials 398 319 -79 ```

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