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7ce66a9b77
# Description
Type-check all closure arguments, not just required arguments.
Not doing so looks like an oversight.
# User-Facing Changes
Previously, passing an argument of the wrong type to a closure would
fail if the argument is required, but be accepted (ignoring the type
annotation) if the argument is optional:
```
> do {|x: string| $x} 4
Error: nu:🐚:cant_convert
× Can't convert to string.
╭─[entry #13:1:21]
1 │ do {|x: string| $x} 4
· ┬
· ╰── can't convert int to string
╰────
> do {|x?: string| $x} 4
4
> do {|x?: string| $x} 4 | describe
int
```
It now fails the same way in both cases.
# Tests + Formatting
Added tests, the existing tests still pass.
Please let me know if I added the wrong type of test or added them in
the wrong place (I didn't spot similar tests in the nu-cmd-lang crate,
so I put them next to the most-related existing tests I could find...
# After Submitting
I think this is minor enough it doesn't need a doc update, but please
point me in the right direction if not.