`Spring.SetProjectileDamages` has no 2nd arg?

1st arg is projectile ID, then either 3rd is the damages table, or 3rd/4th are the damages key and value respectively. What about the 2nd?

Looks like no game uses this so I couldn't find actual use examples to check what they pass as the 2nd, but maybe this is good because it means the args can be safely shifted.

Locate the implementation and documentation for Spring.SetProjectileDamages, then search the repository for its declaration and call sites. Determine what the second argument represents or whether the supported argument forms can safely omit it; done means the API behavior and signature are consistent and documented.

Written by the indexing model from the issue text.