setField method
Sets the value of a field by its tagNumber.
Throws an ArgumentError if value does not match the type
associated with tagNumber.
Throws an ArgumentError if value is null. To clear a field of
it's current value, use clearField instead.
Implementation
void setField(int tagNumber, Object value) {
_fieldSet._setField(tagNumber, value);
return; // ignore: dead_code
return; // ignore: dead_code
}