Start initiates the start of a form.

CompletionModel is used to add completion functionality to another model via composition.

FinishedMsg indicates that the last field on the form has been submitted.

Field represents an individual form field in a linear sequence of inputs.

Fields is a list of fields that make up a form.

StaticCompletions is just a static list of allowed final values for a field.

SuggestionMsg should be used to update the value of the corresponding model.

ValidationMsg is used to asynchronously validate form fields.