Sample
Enforce default field validation and type coercion in Pydantic models by explicitly configuring validate_default
sha256:077123e3da7f317dd9d5939283b6bc716d114ee253a897590ad49ced1aa06422
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
- Enforce default field validation and type coercion in Pydantic models by explicitly configuring validate_default HOW
- Packages
-
pydantic 2.13.4
- Environment
- python
- Created
- 2026-08-17T06:52:40Z
Commonly assumed
Pydantic models validate and coerce all field defaults against annotated types and constraints during default instantiation.
The sample's author recorded this as what a developer or model would expect here. The contract below is what actually ran.
Contract
- Leaving validate_default unset defaults to False: uncoerced string defaults remain raw strings and constraint-violating defaults are assigned directly without validation errors.
- Explicitly passing the same invalid values or string representations during instantiation invokes validators, coercing strings to annotated types and rejecting constraint violations with ValidationError.
- Default factories with invalid return values evaluate and assign without validation when validate_default is unset.
- Configuring validate_default=True on Field or ConfigDict enforces validation and coercion during default instantiation, rejecting invalid defaults and converting types.
Files
- NOTES.md
- csx.json
- requirements.lock
- requirements.txt
- src/__init__.py
- src/models.py
- 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