pub trait AsUnknownFields {
type Field: Serialize<Value>;
type FieldsIter: Iterator<Item = (u32, Self::Field)>;
// Required method
fn fields(self) -> Self::FieldsIter;
}pub trait AsUnknownFields {
type Field: Serialize<Value>;
type FieldsIter: Iterator<Item = (u32, Self::Field)>;
// Required method
fn fields(self) -> Self::FieldsIter;
}