Revert Kotlin to 2.2.21 for binary compatibility #80
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Kotlin 2.3.0 introduced binary incompatibility that breaks downstream consumers still on Kotlin 2.1.x (such as Square's invest service). This reverts Kotlin from 2.3.0 back to 2.2.21 (commit 567058f). Arrow 2.2.1 remains as it is compatible with Kotlin 2.2.21. All tests pass with these versions.
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jacksoncook
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Jan 12, 2026
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I guess we are limited to updating Kotlin version once the monorepo is updated?
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Problem
Kotlin 2.3.0 introduced binary incompatibility that breaks downstream consumers still on Kotlin 2.1.x (including Square internal services).
Solution
This PR reverts Kotlin from 2.3.0 back to 2.2.21 (reverting commit 567058f)
These versions match what was in v0.0.4 and maintain binary compatibility with consumers using Kotlin 2.1.x.
Testing
Next Steps
After merge, will release v0.0.6 with these reverted versions.
Future Work