Problem:    Cannot lock a variable in legacy Vim script like in Vim9.
Solution:   Make ":lockvar 0" work.

https://github.com/vim/vim/commit/a187c43cfe8863d48b2159d695fedcb71f8525c1

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

Problem:    map() returing zero for NULL list is unexpected.
Solution:   Return the empty list. (closes vim/vim#7133)

https://github.com/vim/vim/commit/ffdf8adfa8108d4765fdc68abbd2fe49a4292b25

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

Problem:    This doesn't give the right result: eval(string(v:true)). (Nikolay
            Pavlov)
Solution:   Make the string "v:true" instead of "true".
https://github.com/vim/vim/commit/f48aa160fdd7b8caa7678e1a2139244dd2bdc547

Problem:    Items in a list given to :const can still be modified.
Solution:   Work like ":lockvar! name" but don't lock referenced items.
            Make locking a blob work.
https://github.com/vim/vim/commit/021bda56710d98c09a6b35610a476ab2dd8c58ad

Problem:    Can modify a:000 when using a reference.
Solution:   Make check for locked variable stricter. (Ozaki Kiichi,
            closes vim/vim#3930)
https://github.com/vim/vim/commit/05c00c038bc16e862e17f9e5c8d5a72af6cf7788

Problem:    Comparing two NULL list fails.
Solution:   Change the order of comparing two lists.
https://github.com/vim/vim/commit/7b293c730b07d1586688e622b8d9cbbb4a52379b

N/A patches for version.c:

vim-patch:8.2.1187: terminal2 test sometimes hangs in the GUI on Travis

Problem:    Terminal2 test sometimes hangs in the GUI on Travis.
Solution:   Disable Test_zz2_terminal_guioptions_bang() for now.
https://github.com/vim/vim/commit/c85156bb897085d7f5a8e4e180287f87bf19b948

vim-patch:8.2.1188: memory leak with invalid json input

Problem:    Memory leak with invalid json input.
Solution:   Free all keys at the end. (Dominique Pellé, closes vim/vim#6443,
            closes vim/vim#6442)
https://github.com/vim/vim/commit/6d3a7213f58da834b0fc869d05f87e86010c66cf

vim-patch:8.2.1196: build failure with normal features

Problem:    Build failure with normal features.
Solution:   Add #ifdef.
https://github.com/vim/vim/commit/83e7450053399942e1c9efa802c568b51d948541

vim-patch:8.2.1198: terminal2 test sometimes hangs in the GUI on Travis

Problem:    Terminal2 test sometimes hangs in the GUI on Travis.
Solution:   Move test function to terminal3 to see if the problem moves too.
https://github.com/vim/vim/commit/a4b442614c5ca4ebf32acf5cf0b7b718496f1c94

Problem:    VAR_SPECIAL is also used for booleans.
Solution:   Add VAR_BOOL for better type checking.
https://github.com/vim/vim/commit/9b4a15d5dba354d2e1e02871470bad103f34769a