perf: reduce Context code

[yusukebe]

Don't optimize, but reduce the code.

The author should do the following, if applicable

• Add tests
• Run tests
• bun run format:fix && bun run lint:fix to format the code
• Add TSDoc/JSDoc to document the code

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.31%. Comparing base (c277c75) to head (8fae64e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4100      +/-   ##
==========================================
- Coverage   91.34%   91.31%   -0.04%     
==========================================
  Files         168      168              
  Lines       10700    10649      -51     
  Branches     3181     3092      -89     
==========================================
- Hits         9774     9724      -50     
+ Misses        925      924       -1     
  Partials        1        1              

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[github-actions]

Bundle size check

	main (c277c75)	#4100 (dc22e5e)	+/-
Bundle Size (B)	18,933B	18,116B	-817B
Bundle Size (KB)	18.49K	17.69K	-0.8K

Compiler Diagnostics

	main (c277c75)	#4100 (dc22e5e)	+/-
Files	261	261	0
Lines	116,438	116,367	-71
Identifiers	114,433	114,394	-39
Symbols	303,855	303,786	-69
Types	214,832	214,826	-6
Instantiations	3,091,594	3,091,596	2
Memory used	444,751K	446,776K	2,025K
I/O read	0.02s	0.02s	0s
I/O write	0s	0s	0s
Parse time	0.67s	0.64s	-0.03s
Bind time	0.28s	0.28s	0s
Check time	5.77s	5.47s	-0.3s
Emit time	0s	0s	0s
Total time	6.72s	6.39s	-0.33s

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Reported by octocov