orm.go
func OptFieldTypeSet(cacheType CacheType, cacheSize int) FieldOption {
	return func(options *FieldOptions) {
		options.fieldType = FieldTypeSet
		options.cacheType = cacheType
		options.cacheSize = cacheSize
	}
}
func OptFieldTypeSet(cacheType CacheType, cacheSize int) FieldOption {
	return func(options *FieldOptions) {
		options.fieldType = FieldTypeSet
		options.cacheType = cacheType
		options.cacheSize = cacheSize
	}
}
// OptFieldTypeSet adds a set field.
// Specify CacheTypeDefault for the default cache type.
// Specify CacheSizeDefault for the default cache size.