Problem: Vim9: finding global function without g: prefix but not finding
global variable is inconsistent.
Solution: Require using g: for a global function. Change the vim9.vim
script into a Vim9 script with exports. Fix that import in legacy
script does not work.
Problem: Vim9: inconsistent arguments for test functions.
Solution: When :def function and script have different arguments use a list
with two items instead of a separate function.
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: Tests failing because there is no error for float to string
conversion.
Solution: Change the check for failure to check for correct result. Make
some conversions strict in Vim9 script.
Problem: Various inconsistencies in test files.
Solution: Add modelines where they were missing. Use Check commands instead
of silently skipping over tests. Adjust indents and comments.
(Ken Takata, closes#6695)
