Subspace packWithVersionstamp vs pack

[Shibi-bala]

Hey, been reading through some code to start using Versionstamps in my code, and I noticed some interesting behavior with the two pack methods.

Subspace#pack throws when there is an incomplete versionstamp in the tuple

and

Subspace#packWithVersionstamp throws when there is no incomplete versionstamp in the Tuple

I ended up doing something like the following, and I saw other people have done the same. Was wondering why the api exists like this rather than having a single pack method that delegates to either of these options. Is there a different pattern I should be using here? Is there a case where you would want to call the pack/packWithVersionstamp method and have the exception get thrown?

  if (tuple.hasIncompleteVersionstamp()) {
      return subspace.packWithVersionstamp(tuple);
  } else {
      return subspace.pack(tuple);
  }