Minor update to todo.txt

[Yegappan Lakshmanan]

Hi,

Now that optional arguments to user defined functions are
supported, the following items can be removed from the
todo list:

Implement optional arguments for functions.
func Foo(start, count = 1 all = 1)
call Foo(12)
call Foo(12, all = 0)
call Foo(12, 15, 0)

9 Add optional arguments to user functions:
:func myFunc(arg1, arg2, arg3 = "blah", arg4 = 17)

- Yegappan

[Bram Moolenaar]

Yes, that should work now.

However, named arguments is not implemented yet:

call Foo(12, all = 0)

I suppose this is less important.

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