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4.1.5 Function calls Under "static type analysis", it is worth stating explicitly that the second inference can be used iteratively to handle functions with more than one argument whose type is a union.
The corresponding rules has been moved to Section B.2, and now uses an ellipsis (T1,1|...|Tm,n) which directly covers cases where more than one argument has a union. Added some text to re-emphasize that point. - Jerome