You could support calling f(x) by using a separate kind of function call,
analogous to Lisp apply. f(x) as compared with f(1, 2, 3) really does
a different thing internally, and it was confusing to me as a
new user to discover that these were intended to have the same result.
Maybe you want to consider calling f with arguments being the elements
of the tuple x using the syntax "f x". Then "f (1, 2, 3)" is really
the same kind of function call as "f x". This may be inconsistent with other
aspects of the Python syntax; I dont have my grammar handy.
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