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10 changes: 10 additions & 0 deletions src/engine_args.py
Original file line number Diff line number Diff line change
Expand Up @@ -82,6 +82,16 @@ def _convert_env_value_to_field_type(value: str, field_name: str, field_type: ty
if type(None) in (args or ()):
return None
raise ValueError("empty value not allowed for non-optional field")

# Union[bool, str, ...]: only coerce to bool for unambiguous literals;
# otherwise preserve the string (e.g. hf_token="hf_abc..." must stay a str).
if get_origin(field_type) is not None:
union_types = [a for a in (get_args(field_type) or ()) if a is not type(None)]
if bool in union_types and str in union_types:
if str(val).lower() in ("true", "false", "1", "0", "yes", "no", "on", "off"):
return str(val).lower() in ("true", "1", "yes", "on")
return str(val)

effective_type = _resolve_field_type(field_type)
# bool
if effective_type is bool:
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