toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (few != null) 'few': few!,
if (many != null) 'many': many!,
if (one != null) 'one': one!,
if (other != null) 'other': other!,
if (two != null) 'two': two!,
if (zero != null) 'zero': zero!,
};