Problem:    Vim9: argument types are not checked at compile time.
Solution:   Add more type checks. (Yegappan Lakshmanan, closes #8560)

Problem:    Operators are not fully tested.
Solution:   Add a few more tests. (Yegappan Lakshmanan, closes #8290)

Problem:    Cannot paste a block without adding padding.
Solution:   Add "zp" and "zP" which paste without adding padding. (Christian
            Brabandt, closes #8289)

Problem:    "g$" causes scroll if half a double width char is visible.
Solution:   Advance to the last fully visible character. (closes #8254)

Problem:    Some operators not fully tested.
Solution:   Add a few test cases. (Yegappan Lakshmanan, closes #8282)

Problem:    Code coverage could be improved.
Solution:   Add a few more tests. (Dominique Pellé, closes #7957)

Problem:    No way to check for the cmdwin feature, cmdline_hist is now always
            enabled.
Solution:   Add has('cmdwin') support. Skip arglist test on Windows
            temporarily.

Problem:    Some code in normal.c not covered by tests.
Solution:   Add normal mode tests. (Yegappan Lakshmanan, closes #7086)

Problem:    Some Normal mode commands not fully tested.
Solution:   Add a few more tests. (Yegappan Lakshmanan, closes #7073)

Problem:    Various Normal mode commands not fully tested.
Solution:   Add more tests. (Yegappan Lakshmanan, closes #7059)