Problem:  filetype: ObjectScript are not recognized
Solution: Add ObjectScript filetype detection for *.cls files
          (Hannah Kimura)).

Reference:
https://docs.intersystems.com/latest/csp/docbook/DocBook.UI.Page.cls?KEY=GCOS_intro

closes: vim/vim#19668

https://github.com/vim/vim/commit/b11c8efbe6981076194e00323737780330cfd0a1

Co-authored-by: Hannah <hannah.kimura@intersystems.com>

Problem:  concatenating strings is slow
Solution: Use grow_string_tv() to grow the existing string buffer in
          place when possible (Yasuhiro Matsumoto).

closes: vim/vim#19642

https://github.com/vim/vim/commit/16d421a4d95b45ebbcf47ab60173cdb1b87ce419

Co-authored-by: Yasuhiro Matsumoto <mattn.jp@gmail.com>

Problem:  blob: concatenation can be improved
Solution: Use ga_grow() to allocate space once and mch_memmove() to copy
          the blob data as a single block and fall back to the previous
          byte by byte append (Yasuhiro Matsumoto).

closes: vim/vim#19645

https://github.com/vim/vim/commit/67deae3b7796341ec2ab42faf492f13daea41007

Co-authored-by: Yasuhiro Matsumoto <mattn.jp@gmail.com>

Problem:    The evalfunc.c file is too big.
Solution:   Move undo functions to undo.c.  Move cmdline functions to
            ex_getln.c.  Move some container functions to list.c.

https://github.com/vim/vim/commit/08c308aeb5e7dfa18fa61f261b0bff79517a4883

Co-authored-by: Bram Moolenaar <Bram@vim.org>

These are not needed after #35129 but making uncrustify still play nice
with them was a bit tricky.

Unfortunately `uncrustify --update-config-with-doc` breaks strings
with backslashes. This issue has been reported upstream,
and in the meanwhile auto-update on every single run has been disabled.

Result of `make iwyu` (after some "fixups").

Problem:  Some functions are not tested
Solution: Add a few more tests, fix a few minor problems
          (Yegappan Lakshmanan)

closes: vim/vim#14789

https://github.com/vim/vim/commit/fe424d13ef6e5486923f23f15bb6951e3079412e

Co-authored-by: Yegappan Lakshmanan <yegappan@yahoo.com>

Problem:  too long functions in eval.c
Solution: refactor functions (Yegappan Lakshmanan)

closes: vim/vim#14755

https://github.com/vim/vim/commit/4ceb4dc825854032eed423ec1fc372317d3420bf

Skip the eval_expr_typval() changes.

Co-authored-by: Yegappan Lakshmanan <yegappan@yahoo.com>

Problem:    Vim9: assign test fails.
Solution:   Add missing change.

https://github.com/vim/vim/commit/f24f51d03035379cf3e5b2dccf489a40bc4ca92a

Co-authored-by: Bram Moolenaar <Bram@vim.org>

Problem:    Vim9: cannot use += to append to empty NULL list.
Solution:   Copy the list instead of extending it. (closes vim/vim#6998)

https://github.com/vim/vim/commit/81ed4960482f8baabdd7f95b4d5e39744be88ae7

Co-authored-by: Bram Moolenaar <Bram@vim.org>