40 reduce size

[thomas-saigre]

• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes? (either manual or automated one, cf the documentation)
• Have you successfully run the tests with your changes locally?
• Have you written documentation, even succinct, of your contribution for the online website? TODO

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
src/tikzplotly/_data_container.py	97.54% <100.00%> (+0.60%)	⬆️
src/tikzplotly/_save.py	94.07% <100.00%> (ø)

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