RFR: 8366478: BigDecimal roots [v25]

[Raffaello Giulietti]

On Mon, 27 Oct 2025 17:28:02 GMT, fabioromano1 <duke at openjdk.org> wrote:

>> At some point we also need good whitebox tests, possibly covering all the code paths.
>> Further, an update of the CSR with the new name is needed as well.
>
> @rgiulietti I will add tests after the CSR approval.

@fabioromano1 There are currently no tests for `rootn()` other than the special cases for `sqrt()` and/or on zeros.

Since this PR will probably _not_ make it for the JDK 26 Rampdown planned on 2025-12-04, there's now less pressure to rush them into the PR. However, at some point they will be needed to complete your work on it.

Thanks

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PR Comment: https://git.openjdk.org/jdk/pull/27148#issuecomment-3589564512