fix: small perf improvement

[alexander-akait]

This PR contains a:

• bugfix
• new feature
• code refactor
• test update
• typo fix
• metadata update

Motivation / Use-Case

now we cache contextify

Breaking Changes

No

Additional Info

No

[codecov]

Codecov Report

Merging #544 (9cce059) into master (c799ecc) will decrease coverage by 5.35%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #544      +/-   ##
==========================================
- Coverage   95.03%   89.67%   -5.36%     
==========================================
  Files          15       15              
  Lines         302      310       +8     
  Branches      148      155       +7     
==========================================
- Hits          287      278       -9     
- Misses         15       26      +11     
- Partials        0        6       +6     

Impacted Files	Coverage Δ
src/utils.js	81.50% <100.00%> (-11.41%)	⬇️
src/runtime/injectStylesIntoLinkTag.js	100.00% <0.00%> (ø)
src/runtime/injectStylesIntoStyleTag.js	100.00% <0.00%> (ø)

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