isANumber = (value) => {
        return !isNaN(value);
      }
Parses an OAS string/object as a YAML or JSON
@param {YAML/JSON} openApiSpec - The OAS 3.x specification specified in either YAML or JSON
@param {object} inputValidation - Concrete validator according to version
@param {Object} options computed process options
@returns {Object} - Contains the parsed JSON-version of the OAS spec, or an error
@no-unit-test