Invoke downcall handle with custom memory layout requires arena in params

[tison]

Hi,

This seems undocumented. As in [1], the native method signature is:
FunctionDescriptor.of(either, ValueLayout.ADDRESS).

And below when invoke the method handle, it requires: handle.invoke(arena,
arena.allocateFrom("name")

Where comes this extra param?

Best,
tison.

[1]
https://x.com/tisonkuncz/status/1776518595499217094
<https://x.com/tisonkuncz/status/1776518595499217094?s=46&t=rCbLrJSBayvO_CKE6XmYKQ>
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