Upstream 5.5.0

[michaeam]

• From instructions in UPDATING.md
• Minor fixes
• Upstream merge to main and tagging (5.5.0) left to owner

[hugomg]

Hi Michael, thanks for contributing this.

I noticed that the commit message refers tk "minor fixes". Could you please clarify what those mean?

[michaeam]

Hello Hugo. I've updated the PR, corrected another error, build & run-tested with pallene 5.5.0 (patch for pallene is WIP, some guessing needs to be better validated before PR) and hopefully a somewhat better commit header. with requested clarifications.

Here is a pallene trivial sanity test:

$ pallenec examples/arithmetic/arithmetic.pln
$ lua examples/arithmetic/main.lua 
1 + 2 = 3
1.5 - 3.25 = -1.75
$ 
$ lua -v
Lua 5.5.0  Copyright (C) 1994-2025 Lua.org, PUC-Rio

By this small contribution hoping to encourage your work and pallenes. Both which I think shows huge promise & potential.

Thanks!

[michaeam]

Updated commit-header can be seen here: c27a0ca

[hugomg]

Thanks, Michael. I'm back from the holidays now and I'm excited to see someone offering to contribute the update to 5.5.0!

Do you think it would be too difficult to refactor this PR so there is one commit that just brings merges in the upstream Lua stuff and a separate commit that contains only your customizations? That would make it easier to review the changes and would also help in the long term because sometimes we have to go back and look back at old commits to figure out exactly how Pallene differs from upstream Lua