Description
Field.Number is the base component for receiving user input where the target data is of type number.
There is a corresponding Value.Number component.
When to use and not to use
Field.Number only allows the user to enter numbers (negative and positive) and decimal numbers.
If a number has the type of number, and can not start with a zero, this field may be considered.
But for e.g. a customer number, you rather use Field.String.
Internally, it is used by e.g. Field.Currency.
Autocomplete and autofill
Check out the Field.String docs about autocomplete.