add an arrow when typechecking case-> #1000
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For a function that has optional parameter types [t1, t2, t_i ... t_n], if each of [t_i ... t_n] is a supertype of the first rest parameter type, add to the resulting the function type one arrow with [t_i ... t_n] being absorbed into the rest.
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For a function that has optional parameter types [t1, t2, t_i ... t_n], if each
of [t_i ... t_n] is a supertype of the first rest parameter type, add to the
resulting the function type one arrow with [t_i ... t_n] being absorbed into
the rest.