$ javac src/SealedExhaustive.java && java SealedExhaustive     (21.0.10+7-Ubuntu-124.04)
Circle[r=1.0] -> 3.14
Square[side=2.0] -> 4.00
Rect[w=2.0, h=3.0] -> 6.00

$ javac src/SealedExhaustive.java && java SealedExhaustive     (25.0.4.1+1-LTS)
Circle[r=1.0] -> 3.14
Square[side=2.0] -> 4.00
Rect[w=2.0, h=3.0] -> 6.00

$ javac src/SealedExhaustive.java && java SealedExhaustive     (27+35)
Circle[r=1.0] -> 3.14
Square[side=2.0] -> 4.00
Rect[w=2.0, h=3.0] -> 6.00

$ javac broken/NotExhaustive.java     (21.0.10+7-Ubuntu-124.04)
broken/NotExhaustive.java:8: error: the switch expression does not cover all possible input values
        return switch (s) {
               ^
1 error

$ javac broken/NotExhaustive.java     (25.0.4.1+1-LTS)
broken/NotExhaustive.java:8: error: the switch expression does not cover all possible input values
        return switch (s) {
               ^
1 error

$ javac broken/NotExhaustive.java     (27+35)
broken/NotExhaustive.java:8: error: the switch expression does not cover all possible input values
        return switch (s) {
               ^
  missing patterns:
      Rect _
1 error

$ javac broken/NotExhaustiveObject.java     (21.0.10+7-Ubuntu-124.04)
broken/NotExhaustiveObject.java:3: error: the switch expression does not cover all possible input values
        return switch (o) {
               ^
1 error

$ javac broken/NotExhaustiveObject.java     (25.0.4.1+1-LTS)
broken/NotExhaustiveObject.java:3: error: the switch expression does not cover all possible input values
        return switch (o) {
               ^
1 error

$ javac broken/NotExhaustiveObject.java     (27+35)
broken/NotExhaustiveObject.java:3: error: the switch expression does not cover all possible input values
        return switch (o) {
               ^
  missing patterns:
      Object _
1 error