Performance dropped significantly when switching from Nested Patterns to Flattened Patterns (was "Sharing my experience with Switch Expressions")

[David Alayachew]

Whoops, looks like the original thread did not get included during the
rename. Here is a link to the original thread --
https://mail.openjdk.org/pipermail/amber-dev/2025-May/009299.html

Alternatively, if you just want to jump to the code examples, I copied and
pasted them below.

Nested =
https://github.com/davidalayachew/HelltakerPathFinder/blob/12c57dab041924192b8613075ff6966b1b159e91/src/main/java/HelltakerPathFinderModule/HelltakerPathFinderPackage/Board.java#L511

Flattened =
https://github.com/davidalayachew/HelltakerPathFinder/blob/10b7a9d5fc4f6f563a68824de9a70735c7533226/src/main/java/HelltakerPathFinderModule/HelltakerPathFinderPackage/Board.java#L512

If you need me to provide a simplified example, I am happy to. Just let me
know.
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