Submission data.

@remarks 
This can either be a plain JavaScript object or `FormData`. If `FormData` contains files,
the submission will be rejected. If your form contains file uploads, please upload them using `formium.uploadFile(formSlug, file)` first, and store the returned URL. For more information about uploads, please refer to `formium.uploadFile`.

For security, Formium upholds the following limits on data that you should be aware of:
  - The following keys are banned: `pass`, `password`, `pw`, `ssn`, `cc`, `creditCard`, `credit_card`, `creditcard`, `cardNumber`, `cardnumber`, `card_number`.
  - Objects with data deeper than 3 levels of nesting will be stringified
  - All keys must be shorter than 32 characters
  - JSON payloads must be less than 5KB for non-enterprise users

Calling `submiForm` with `FormData` instead of an JavaScript object works as well. In addition, if your form contains `<select multiple>`, that value will
be automatically converted to an array of strings instead of a comma-delimited string. This is for your convenience.

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