Choice of complex buffer protocol format intentional break with PEP?

[ngoldbaum (Nathan Goldbaum)]

@vstinner

As Sergey wrote above, in the bfloat16 format discussion, Serhiy proposed adding an API to register custom types:

@storchaka

For perfomance, we need the C API for registering custom types, but for convenience, we need also the Python API.

For what it’s worth, I’m hoping to revive the pre-PEP Sebastian and I explored in 2025. Now that I have triage rights in CPython it seems like a fun and useful way to make a more substantial contribution to CPython. Hopefully you’ll hear something more detailed from me later this year.