Rule py_proto_library doesn't use upb backend as the documentation says

[dpar39]

What version of protobuf and what language are you using? Version: 29.4 (https://github.com/protocolbuffers/protobuf/releases/download/v29.4/protobuf-29.4.zip) Language: Python

What operating system (Linux, Windows, ...) and version? Ubuntu 22.04

What runtime / compiler are you using (e.g., python version or gcc version) gcc 11.2, python 3.10

What did you do? Add a simple py_test target like this:

load("@com_github_grpc_grpc//bazel:python_rules.bzl", "py_proto_library") # or load("@com_google_protobuf//bazel:py_proto_library.bzl", "py_proto_library")
load("@com_google_protobuf//bazel:proto_library.bzl", "proto_library")

py_test(
    name = "check_protobuf_api_implementation_test",
    srcs = ["check_protobuf_api_implementation_test.py"],
    deps = [":py_dummy"],
)

proto_library(
    name = "dummy_proto",
    srcs = ["dummy.proto"],
)

py_proto_library(
    name = "py_dummy",
    deps = [":dummy_proto"],
)

check_protobuf_api_implementation_test.py

from google.protobuf.internal import api_implementation
def test_api_implementatation() -> None:
    assert api_implementation.Type() == "upb"

What did you expect to see api_implementation.Type() == "upb" is True,

What did you see instead? python

Anything else we should know about your project / environment

[honglooker]

Hmm maybe oversight or version differential? cc @anandolee

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