Source: nanobind Followup-For: Bug #1085019 Upstream are indeed aware of the ABI issue, https://github.com/wjakob/nanobind/blob/master/docs/changelog.rst
They do provide an official ABI version. nanobind 2.2.0 bumped up to ABI version 15. They are using semantic versions, so we can expect an ABI bump with every minor release, with Y in version X.Y.Z.
