fix: switch always compare like types

_test/switch38.go

@@ -0,0 +1,28 @@
+package main
+
+func isSeparator(c byte) bool {
+	switch c {
+	case '(', ')', '<', '>', '@', ',', ';', ':', '\\', '"', '/', '[', ']', '?', '=', '{', '}', ' ', '\t':
+		return true
+	}
+	return false
+}
+
+func main() {
+	s := "max-age=20"
+	for _, c := range []byte(s) {
+		println(string(c), isSeparator(c))
+	}
+}
+
+// Output:
+// m false
+// a false
+// x false
+// - false
+// a false
+// g false
+// e false
+// = true
+// 2 false
+// 0 false

interp/run.go

@@ -2309,8 +2309,13 @@ func _case(n *node) {
 			values[i] = genValue(n.child[i])
 		}
 		n.exec = func(f *frame) bltn {
+			v0 := value(f)
 			for _, v := range values {
-				if value(f).Interface() == v(f).Interface() {
+				v1 := v(f)
+				if !v0.Type().AssignableTo(v1.Type()) {
+					v0 = v0.Convert(v1.Type())
+				}
+				if v0.Interface() == v1.Interface() {
 					return tnext
 				}
 			}