Go's type switch allows a short variable declaration in the switch guard, giving the variable the specific type of each matched case. However, when a case lists multiple types, the variable reverts to the original interface type rather than any of the listed types — causing a compile error if you try to use it as a concrete type. This means combining multiple numeric types into one case clause won't work when you need to convert the variable, forcing you to write separate case clauses for each type.
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Type switches3 Impressions