Numbers converted into scientific notation are not considered valid numbers #308

The property pvalue_threshold in https://nodenormalization-sri.renci.org/openapi.json fails validation because the default value (0.000001) is converted into scientific notation in Python (1e-06), which is judged to not be a valid number (Could not validate OpenAPI at https://nodenormalization-sri.renci.org/openapi.json: '1e-06' is not of type 'number'). Is there any way to work around this?

May be related to #115