Inconsistent conversion from string to int

[dd2912]

Bug Report: Inconsistent Handling of string values in merge_from_file()

Description:
I encountered an issue when using merge_from_file() with a YAML configuration where the key seq: stores a sequence subfolder name as strings ("00", "01", "02", ..., "10", "11", etc.).

• Expected behavior: When seq: '03' is specified in the YAML file, the merge works without issues.
• Issue: However, when seq: '10' is used, I receive a ValueError indicating a type mismatch between str and int.

Error Message:

Traceback (most recent call last):
  File "[PATH]/yac/main.py", line 5, in <module>
    cfg.merge_from_file("experiment.yaml")
  File "[PATH]/python3.12/site-packages/yacs/config.py", line 213, in merge_from_file
    self.merge_from_other_cfg(cfg)
  File "[PATH]/python3.12/site-packages/yacs/config.py", line 217, in merge_from_other_cfg
    _merge_a_into_b(cfg_other, self, self, [])
  File "[PATH]/python3.12/site-packages/yacs/config.py", line 474, in _merge_a_into_b
    v = _check_and_coerce_cfg_value_type(v, b[k], k, full_key)
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "[PATH]/python3.12/site-packages/yacs/config.py", line 534, in _check_and_coerce_cfg_value_type
    raise ValueError(
ValueError: Type mismatch (<class 'str'> vs. <class 'int'>) with values (01 vs. 10) for config key: seq

Example Code:

Here’s a simplified version of the code demonstrating the issue:

config.py

from yacs.config import CfgNode as cn
_cn = cn()
_cn.seq = "01"

def get_cfg():
    return _cn.clone()

main.py

from config import get_cfg

if __name__ == "__main__":
    cfg = get_cfg()
    cfg.merge_from_file("experiment.yaml")
    cfg.freeze()
    print(cfg)

YAML File: working

seq: '03'

YAML File: with error

seq: '10'