chore: add more friendly warnings

[liuq19]

As the title

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 51.51%. Comparing base (121df0a) to head (af9ecec).
Report is 2 commits behind head on main.

Files	Patch %	Lines
internal/encoder/vars/errors.go	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #671      +/-   ##
==========================================
- Coverage   52.66%   51.51%   -1.16%     
==========================================
  Files         172      143      -29     
  Lines       11334    11391      +57     
==========================================
- Hits         5969     5868     -101     
- Misses       5044     5200     +156     
- Partials      321      323       +2     

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