Problem: Vim9: runtime and compile time type checks are not the same.
Solution: Add more runtime type checks for builtin functions. (Yegappan
Lakshmanan, closes#8646)
Problem: Vim9: argument types are not checked at compile time.
Solution: Add several more type checks, also at runtime. (Yegappan
Lakshmanan, closes#8587)
Problem: Highlight of char beyond line end is not correct. (Chuan Wei Foo)
Solution: Fix counting NUL as one cell. Draw one more character if the EOL
is part of the match. (closes#7883)
Problem: Highlight and match functionality together in one file.
Solution: Move match functionality to a separate file. (Yegappan Lakshmanan,
closes#6352)
