hash tryouts

[tkh44]

What:

Why:

How:

Checklist:

• Documentation
• Tests
• Code complete

[codecov]

Codecov Report

Merging #336 into master will decrease coverage by 0.14%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #336      +/-   ##
==========================================
- Coverage   97.33%   97.18%   -0.15%     
==========================================
  Files          17       17              
  Lines         562      533      -29     
  Branches      133      134       +1     
==========================================
- Hits          547      518      -29     
  Misses         11       11              
  Partials        4        4

Impacted Files	Coverage Δ
...ages/emotion/test/extract/extract.test.emotion.css	100% <100%> (ø)	⬆️
packages/emotion-utils/src/hash.js	100% <100%> (ø)	⬆️
packages/react-emotion/src/index.js	100% <0%> (ø)	⬆️
packages/emotion/src/index.js	100% <0%> (ø)	⬆️

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