ARCHIVED TRAINING / omni-us/jsonargparse

omni-us__jsonargparse-827

This is a preserved training example. Membership in the current training wave has not been verified.

Problem statement

The `choices` parameter of `add_argument()` is not functioning correctly.
<!-- If you like this project, please ⭐ star it https://github.com/omni-us/jsonargparse/ -->

## 🐛 Bug report

<!-- A clear and concise description of the bug. -->

### To reproduce

```python
from jsonargparse import ArgumentParser

parser = ArgumentParser()
parser.add_argument("--mode", type=int, default=1, choices=[0, 1])
cfg = parser.parse_args()

print(cfg.mode)
```
Output:
```shell
> python argparse_test.py --mode 1
usage: argparse_test.py [-h] [--mode {0,1}]
argparse_test.py: error: argument --mode: invalid choice: '1' (choose from 0, 1)
```

### Expected behavior

Aligned with `argparse`.
```python
import argparse

parser = argparse.ArgumentParser()
parser.add_argument("--mode", type=int, default=1, choices=[0, 1])
cfg = parser.parse_args()

print(cfg.mode)
```
Output:
```shell
> python argparse_test.py --mode 1
1
```

### Environment

<!-- Fill in the list below. -->

- jsonargparse version (e.g., 4.8.0): 4.27.1
- Python version (e.g., 3.9): 3.8.17
- How jsonargparse was installed (e.g. `pip install jsonargparse[all]`): pip install jsonargparse[signatures,omegaconf,urls]>=4.25.0
- OS (e.g., Linux): Ubuntu 20.04.5 LTS

Training membership

opd_e4b_pure_v6b

Task issues extracted from preserved verified_rft_messages training examples. This is not a verified current RL wave manifest.

Task and snapshot provenance

Snapshot captured 2026-11-12T17:06:59.476467+00:00 · Autoresearch-Arena/gemma-4-developer-agent

{
  "datasets": [
    "opd_e4b_pure_v6b"
  ],
  "examples": 3,
  "instance_id": "omni-us__jsonargparse-827",
  "problem_statement": "The `choices` parameter of `add_argument()` is not functioning correctly.\n<!-- If you like this project, please ⭐ star it https://github.com/omni-us/jsonargparse/ -->\r\n\r\n## 🐛 Bug report\r\n\r\n<!-- A clear and concise description of the bug. -->\r\n\r\n### To reproduce\r\n\r\n```python\r\nfrom jsonargparse import ArgumentParser\r\n\r\nparser = ArgumentParser()\r\nparser.add_argument(\"--mode\", type=int, default=1, choices=[0, 1])\r\ncfg = parser.parse_args()\r\n\r\nprint(cfg.mode)\r\n```\r\nOutput:\r\n```shell\r\n> python argparse_test.py --mode 1\r\nusage: argparse_test.py [-h] [--mode {0,1}]\r\nargparse_test.py: error: argument --mode: invalid choice: '1' (choose from 0, 1)\r\n```\r\n\r\n### Expected behavior\r\n\r\nAligned with `argparse`.\r\n```python\r\nimport argparse\r\n\r\nparser = argparse.ArgumentParser()\r\nparser.add_argument(\"--mode\", type=int, default=1, choices=[0, 1])\r\ncfg = parser.parse_args()\r\n\r\nprint(cfg.mode)\r\n```\r\nOutput:\r\n```shell\r\n> python argparse_test.py --mode 1\r\n1\r\n```\r\n\r\n### Environment\r\n\r\n<!-- Fill in the list below. -->\r\n\r\n- jsonargparse version (e.g., 4.8.0): 4.27.1\r\n- Python version (e.g., 3.9): 3.8.17\r\n- How jsonargparse was installed (e.g. `pip install jsonargparse[all]`): pip install jsonargparse[signatures,omegaconf,urls]>=4.25.0\r\n- OS (e.g., Linux): Ubuntu 20.04.5 LTS",
  "repo": "omni-us/jsonargparse",
  "source": "v2/experiments/train_data/opd_e4b_pure_v6b/verified_rft_messages.jsonl",
  "source_sha256": "0f62460a9706eea5e1605255896f191ab00cb5706c5f1f2e1c293e9a718218dc"
}

{
  "captured_at": "2026-11-12T17:06:59.476467+00:00",
  "membership": "archived training",
  "membership_evidence": "Task issues extracted from preserved verified_rft_messages training examples. This is not a verified current RL wave manifest.",
  "name": "Preserved post-training task archive",
  "source": "Autoresearch-Arena/gemma-4-developer-agent",
  "source_revision": "016496de222aaafca0d4ee4c18efc63ba616f76e",
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}