who’s even reading this

README.md

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-# pycapnp for IQPilot
-
-IQ.Lvbs maintains this fork at https://git.konn3kt.com/IQ.Lvbs/pycapnp.
-It extends comma's minimal branch at `caee18aeef0a9a54ad8f98292a325a1675a43bec`.
-The upstream licenses and history are retained.
-
-IQPilot additions:
-
-- Native NumPy conversion for floating-point list readers and builders through
-  `__array__`, retaining inferred dtype, explicit casts and warnings, writable
-  independent output, and rejection of unsupported `copy=False` requests.
-- `to_float64_bytes()` for an owned native-endian numeric snapshot without
-  constructing intermediate Python scalar objects. Non-numeric values are rejected.
-- Direct serialization into the final Python bytes object, preserving segment
-  framing and byte identity while removing the intermediate flat-array copy.
-
-NumPy is optional at runtime and loaded lazily only when its array protocol is used.
-The validation suite additionally requires NumPy. Serialization reference hashes
-were generated by the unmodified comma commit above and cover one and multiple
-segments through megabyte payloads. The native helpers do not borrow message memory.
-
-A serialization-only fork of [pycapnp](https://github.com/capnproto/pycapnp).
-The `minimal` branch starts at upstream commit
-`a0cb5cdf0673481f2f9850541f4d42b89698c476`, including the `from_dict` reference-cycle
-fix in upstream PR #407.
-
-The supported surface is based on openpilot at
-`7f6f13997c3c9b8e27e1581583f61e3fcabc5151`, including its opendbc checkout:
-
-- Explicit schema loading with `capnp.load()` and schema imports.
-- Dynamic structs, lists, enums, unions, nested groups, and constants.
-- Message construction, field access (including cached `_get_by_field` and
-  `_set_by_field`), dictionaries, reader/builder copies, and pickling.
-- Unpacked `to_bytes()`, `from_bytes()`, and `read_multiple_bytes()`, including
-  traversal/nesting limits and readers that retain their underlying message.
-- Schema reflection for cereal, CAN conversion, WebRTC, fuzzing, and replay tools.
-
-Removed: RPC/capabilities, promises, KJ event loops, asyncio/network streams,
-packed serialization, file-descriptor I/O, segment APIs, borrowed Data views,
-custom allocators, orphans/resizable lists, AnyPointer wrappers, type registration,
-the Python schema import hook, and the Cython code generator. Their examples,
-tests, docs, dependencies, and unsupported-platform CI were removed too.
-Also removed are generated per-schema `Reader`/`Builder` classes, synthetic
-`.Union` enums, `_has_by_field`/`_init_by_field`, allocation-size overrides,
-`from_bytes(builder=True)`, and `to_dict` ordering/base64 options. Incoming base64
-Data values in `from_dict` remain supported. Unused schema reset/metadata helpers,
-schema equality, `_which_str`, and legacy exception arguments were removed too.
-`remove_import_hook()` remains a no-op for cereal/opendbc compatibility.
-
-This is intentionally not a full upstream API replacement. The import and
-package names remain `capnp` and `pycapnp`. It must replace the installed pycapnp,
-not be installed alongside another distribution providing `capnp`.
-
-## Build and test
-
-Targets: CPython 3.12, Linux x86_64/aarch64, and macOS arm64. A C++17 compiler and
-CMake are required to build the vendored library.
-
-```sh
-uv venv --python 3.12
-uv pip install cython setuptools wheel pytest numpy build
-.venv/bin/python setup.py build_ext --inplace
-.venv/bin/python -m pytest
-.venv/bin/python -m build
-```
-
-The C++ library is vendored under [`vendor/capnproto`](vendor/capnproto), based on
-Cap'n Proto 1.4.0. Every build compiles and statically links this copy; it does not
-search for a system Cap'n Proto installation or download sources. The source
-archive includes the vendored files, and wheels contain the compiled library.
-Runtime schema parsing remains included, so cereal schemas need no generated
-Python bindings. See the vendor README for provenance and the removed features.
-
-The retained upstream tests cover message construction, schema loading,
-reflection, binary fixtures, serialization, and exceptions. Added lifetime tests
-check kwargs construction with GC disabled and readers surviving their input or
-iterator. Optional integration tests use real openpilot schemas and exercise
-messaging, CAN conversion, WebRTC reflection, LogReader, pickling, and replay:
-
-```sh
-# Run in an environment with openpilot's dependencies and this fork installed.
-OPENPILOT_PATH=/path/to/openpilot python -m pytest test/test_openpilot.py
-python -m pytest /path/to/openpilot/openpilot/cereal/messaging/tests \
-  /path/to/openpilot/openpilot/tools/lib/tests/test_logreader.py
-```
-
-See [LICENSE.md](LICENSE.md) for the upstream BSD license and attribution.