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It appears to only be possible to define functions with a fixed number of arguments.

Perhaps the simplest solution would be some basic polymorphism. Example:

fn doStuff a b
	echo a: $a, b: $b
end

fn doStuff a
	doStuff $a "not_specified"
end

doStuff "test" 
# "a: test, b: not_specified"

Or, perhaps cleaner, argument expansion:

fn printSection label ...list
	echo -e "\n\n$label:"

	for item in @list
		echo "- $item"
	end
end

printSection todo "type foo" "make bar"
# todo:
# - type foo
# - make bar