A range of field numbers or enum constants. The upper bound can be left unspecified if 'max' is desired. The
acceptable values for from() and to() are different for fields vs. enum constants.
The start of the range (inclusive). Minimum value is 1 for field numbers, but can be any 32-bit value for enums
(including negative values).
to
int to
The end of the range (inclusive). Must be strictly greater than from(). The actual maximum is MAX_FIELD
(229-1 = 536870911) for field numbers, but it can be any 32-bit value for enums.