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What can I do with inline classes for Java interop? Currently I have methods returning useless `Object` or `Object[]`, and extensions with hyphen and hash, absolutely unusable from Java.

Make them non inline, or provide a java targeted overload for Java exposing the wrapped type or a non inline wrapper.

First class Java interop with inline classes is not supported, and we don't know if it will ever be.

But as Louis wrote, create a Java-friendly wrapper