Firebase transaction

[benzenwen]

Firebase's transaction provides for atomic data modification, useful for multi-user applications that edit data dynamically.

This pull requests implements a straight JavaScript translation :firebase/transaction, and a more Clojure-y variant :firebase/swap that accepts an :argv vector for passing in other values.

Please let me know if there are any suggested changes or administrative tasks that I can undertake that make your review easier.

Thank you for your consideration.

[benzenwen]

Rebased to a single commit as discussed.

With gratitude, B.

[deg]

I just read your comments and skimmed the code. I like this direction a lot; thanks for writing it!

My only problem is that I don't have time to test for at least the next week or two. For now, please continue using this privately, with my assurances that:

• I expect that I will happily accept this code sometime soon
• I don't plan to make any other changes to master before this code

If other folks are reading this exchange and also wants to use this, please upvote or comment.

[benzenwen]

Thank you. 🙏 That timing is fine. Let me know if there are any changes you'd recommend.