Unexpected behaviour in pandas_convert method when setting scr and to to the same value. The current implementation contains an exit condition, which returns the series without making any conversions.

Although this may provide some minor efficiency gains, it adds some unexpected behaviour. The main convert function does not have a similar exit condition causing different values returned. For a series with mixed types (eg. ISO3 and other types) and converting to ISO3, pandas_convert will return the series with original values, while convert will still run the conversion setting values not found to "not found" or another value set for the not_found argument.

This can be resolved by removing the exit condition so that it aligns with the convert functionality, or enhancing the documentation (or logging a warning for users)