oneof produces type with required fields

[ron23]

proto3: when using oneof I expect to get a union of the various options. Right now all the fields are required.

// proto
message ABC {
  oneof something {
    string a = 1;
    string b = 2;
  }

// generated
export namespace ABC {
  export type AsObject = {
    a: string,
    b: string,
  }

I expected to get something like:

export namespace ABC {
    type A = {  a: string };
    type B = {  b: string };

    export type AsObject = A | B

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