Sample
numpy.asarray copy parameter enforces strict zero-copy validation and controls memory sharing and subclass downcasting
sha256:0880b370832848505bdcf9f712552b384076319928506f5bf53a9957048646bc
PUBLISHED
L3_CONTRACT_PASS
MIT-0
Execution evidence
Declared environment and signed verification runs are separated so you can see exactly what this sample proves.
Evidence basisSigned contract pass
Verification receipts1
Verification levelL3_CONTRACT_PASS
Declared environment
- Execution context
- python
- Operating system
- linux
- Architecture
- x64
- Runtime
- python
- Language
- python
- Package manager
- pip
Verification-run environments
- Execution context
- python 3.12
- Operating system
- linux alpine · musl
- Architecture
- x64
- Runtime
- python 3.12
- Language
- python
- Package manager
- pip
- Execution
- container · docker
CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · python@1 · 2026-08-17
Case
- Goal
- numpy.asarray copy parameter enforces strict zero-copy validation and controls memory sharing and subclass downcasting HOW
- Packages
-
numpy 2.5.2
- Environment
- python
- Created
- 2026-08-17T22:13:25Z
Commonly assumed
numpy.asarray with copy=False creates an ndarray from any sequence without raising an exception
The sample's author recorded this as what a developer or model would expect here. The contract below is what actually ran.
Contract
- numpy.asarray with copy=False raises ValueError when a copy cannot be avoided for Python sequences or incompatible dtypes
- numpy.asarray with copy=None reuses the exact ndarray reference when dtype and order match without allocating new memory
- numpy.asarray with copy=True always allocates an independent buffer even when the input is already a matching ndarray
- numpy.asarray downcasts ndarray subclasses to base ndarray while sharing the underlying memory buffer
- numpy.asarray with copy=False raises ValueError when changing memory order requires a non-contiguous buffer copy
Files
- NOTES.md
- csx.json
- requirements.txt
- test/contract.py
Download the source artifact (tar.gz)
Origin Seeder
csx-seed
Verification receipts
- python 3.12 · linux alpine/x64 · docker · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · python@1 · 2026-08-17 · ed25519:d91480838ac982c9