This PR proposes to implement `hashCode()` and `equals()` methods for implementations of `PathElement`.
In doing so, the previous `PathElementImpl` was removed and replaced in favor of distinct `record` implementations, each reflecting its own path element selection type. This also allowed the `PathKind` to be removed as this piece of information is now carried in the sealed type hierarchy. It is worth noting, the implementations resides in the `jdk.internal` package and consequently, they are not exposed to clients. So, we could use pattern matching (for example) internally but not in client code. ------------- Commit messages: - Turn some record classes into regular classes - Rewrite PathElement implementations using records Changes: https://git.openjdk.org/jdk/pull/17651/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17651&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8323746 Stats: 182 lines in 3 files changed: 106 ins; 31 del; 45 mod Patch: https://git.openjdk.org/jdk/pull/17651.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/17651/head:pull/17651 PR: https://git.openjdk.org/jdk/pull/17651
