Problem:    :confirm may happen in cooked mode. (Jason Franklin)
Solution:   Switch to raw mode before prompting. (Brandon Pfeifer)

Problem:    Not enough testing for Python.
Solution:   Add more tests.  Fix uncovered problems. (Yegappan Lakshmanan,
            closes #6392)

Problem:    Vim9: "for" only accepts a list at compile time.
Solution:   Also accept a list at runtime.

Problem:    Vim9: return type of reverse() is any.
Solution:   Use the type of the first argument.

Problem:    Vim9: return type of remove() is any.
Solution:   Use the member type of the first argument, if known.

Problem:    Vim9: return type of insert() is any.
Solution:   Use type of the first argument.

Problem:    Vim9: return type of filter() is any.
Solution:   Use type of the argument.

Problem:    Vim9: return type of extend() is any.
Solution:   Use type of the argument.

Problem:    Vim9: test for silent echo fails in some environments.
Solution:   Use :function instead of :def.

Problem:    Vim9: return type of copy() and deepcopy() is any.
Solution:   Use type of the argument.

Problem:    Vim9: modifiers not cleared after compiling function.
Solution:   Clear command modifiers. (closes #6396)

Problem:    Vim9: return type of argv() is always any.
Solution:   Use list<string> if there is no argument.

Problem:    Vim9: getting a dict member may not work.
Solution:   Clear the dict only after copying the item.

Problem:    Vim9: getting a list member may not work.
Solution:   Clear the list only after copying the item. (closes #6393)

Problem:    Vim9: return type of add() is not specific enough.
Solution:   Return the type of the first argument. (closes #6395)

Problem:    Vim9: return type of repeat() is not specific enough.
Solution:   Return the type of the first argument. (closes #6395)

Problem:    Vim9: error message for returning a value in a function that does
            not return anything is not clear.
Solution:   Add a specific message.

Problem:    Vim9: bar not recognized after function call
Solution:   Skip whitespace. (closes #6391)

Problem:    Vim9: bar not recognized after not compiled command.
Solution:   Check for bar for commands where this is possible. (closes #6391)

Problem:    The write message mentions characters, but it's actually bytes.
Solution:   Change "C" to "B" and "characters" to "bytes".

Problem:    Vim9: getting a dict member may not work.
Solution:   Clear the dict only after copying the item. (closes #6390)

Problem:    Vim9: using :copen causes an error.
Solution:   Add flag LET_NO_COMMAND in set_var().

Problem:    Vim9: double quote can be a string or a comment.
Solution:   Only support comments starting with # to avoid confusion.

Problem:    Vim9: no line break allowed in :import command.
Solution:   Skip over line breaks.

Problem:    Python 3 test is old style.
Solution:   Turn into new style test. (Yegappan Lakshmanan, closes #6385)

Problem:    Vim9: line continuation in dict member not recognized.
Solution:   Check for line continuation.

Problem:    Command completion not working after ++arg.
Solution:   Move skipping up. (Christian Brabandt, closes #6382)

Problem:    Python code not tested properly.
Solution:   Add more tests and convert old-style test into new-style test.
            (Yegappan Lakshmanan, closes #6370)

Problem:    Configure fails with Xcode 12 beta.
Solution:   use "return" instead of "exit()". (Nico Weber, closes #6381)

Problem:    Condition can never be true, dead code.
Solution:   Remove the dead code.

Problem:    Coverity warns for unsing unitialized field.
Solution:   Initialize v_lock.

Problem:    Vim9: parsing command checks for list twice.
Solution:   Adjust how a command is parsed.

Problem:    Iminsert test fails when compiled with VIMDLL.
Solution:   Change condition. (Ken Takata, closes #6376)

Problem:    Terminal test sometimes times out.
Solution:   Split the test in two parts.

Problem:    No test for verbose output of :call.
Solution:   Add a test.

Problem:    Vim9: no line continuation allowed in method call.
Solution:   Handle line continuation in expression before method call.

Problem:    Inconsistent naming of get_list_tv() and eval_dict().
Solution:   Rename get_list_tv() to eval_list().  Similarly for eval_number(),
            eval_string(), eval_lit_string() and a few others.

Problem:    Vim9: line continuation does not work in function arguments.
Solution:   Pass "evalarg" to get_func_tv().  Fix seeing double quoted string
            as comment.

Problem:    Still crashing when using s:variable.
Solution:   Remove assignment. (Ken Takata)

Problem:    Mouse left-right scroll is not supported in terminal window.
Solution:   Implement mouse codes 6 and 7. (Trygve Aaberge, closes #6363)