Optimize numeric array conversion and serialize directly into Python bytes

README.md

@@ -1,4 +1,23 @@
-# pycapnp for openpilot
+# 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
@@ -39,7 +58,7 @@ CMake are required to build the vendored library.
 
 ```sh
 uv venv --python 3.12
-uv pip install cython setuptools wheel pytest build
+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