Problem:    Vim9: Partial call does not check right arguments.
Solution:   Adjust the offset for whether the partial is before or after the
            arguments. (closes #8091)

Problem:    Vim9: lambda with varargs doesn't work.
Solution:   Make "...name" work.  Require type to be a list.

Problem:    Vim9: a lambda accepts too many arguments at the script level.
Solution:   Do not set uf_varargs in Vim9 script.

Problem:    Extending a list with itself can give wrong result.
Solution:   Remember the item before where the insertion happens and skip to
            after the already inserted items. (closes #1112)

Problem:    Status line not updated when local 'statusline' option set.
Solution:   Check the 'statusline' option of each window.

Problem:    Vim9: for loop over string is a bit slow.
Solution:   Avoid using strlen().

Problem:    Vim9: function reference found with prefix, not without.
Solution:   Also find function reference without prefix.

Problem:    Vim9: cannot use legacy script-local var from :def function.
Solution:   Do not insist on using "s:" prefix. (closes #8076)

Problem:    Detecting Lua version is not reliable.
Solution:   Add "vim.lua_version". (Ozaki Kiichi, closes #8080)