flatten-ocds output given this file: https://docs.google.com/spreadsheets/d/1k3t1cTMpT2KVC9CpMInF5ty_GhIzRET9VlUMjwszYZM/edit#gid=0

cli_output.txt

~/code/opencontracting/flattening-ocds(master)» ./flatten-ocds unflatten in/errors.xlsx -f xlsx -m Sheet1 -o out/error.json
/home/bjwebb/code/opencontracting/flattening-ocds/flattening_ocds/input.py:199: UserWarning: Non-integer value "notanint" found in integer column, returning as string instead.
  warn('Non-integer value "{}" found in integer column, returning as string instead.'.format(value))
/home/bjwebb/code/opencontracting/flattening-ocds/flattening_ocds/input.py:193: UserWarning: Non-numeric value "notanumber" found in number column, returning as string instead.
  warn('Non-numeric value "{}" found in number column, returning as string instead.'.format(value))

error.json

{
    "releases": [
        {
            "ocid": 1,
            "a": 1,
            "b": 1.2,
            "c": "1994-11-05T13:15:30Z"
        },
        {
            "ocid": 1,
            "a": "notanint",
            "b": "notanumber",
            "c": "2015-01-01T00:00:00+00:00"
        }
    ]
}