On Tue, 23 Jul 2024 12:37:40 GMT, Claes Redestad <redes...@openjdk.org> wrote:
>> The spec for concat only asked for equal representation instead of the >> existence of a new identity. Thus this should be fine. > > Yes, this isn't beholden to JLS 15.18.1, and it's already specified that > `foo.concat("")` returns `foo` - so why shouldn't `"".concat(foo)` return > `foo`? But still it's an observable semantic change so some care needs to be > taken - possibly even a CSR is warranted. Doing `return new String(str)` to > retain behavior avoids that headache for a fringe case. Adding isEmpty check is not related to this PR and should be a new PR. ------------- PR Review Comment: https://git.openjdk.org/jdk/pull/20253#discussion_r1688007455