RFR: 8377427: Reduce substring allocations in Color.web(String, double) [v10]

[Andy Goryachev]

On Fri, 20 Feb 2026 01:31:18 GMT, Michael Strauß <mstrauss at openjdk.org> wrote:

>> I've added these tests. The reason why `assertSameDouble(0.19999999999999998335, "0.19999999999999998335")` fails is because there are more digits in the number than fit in a `long`, and thus the actual number being parsed is truncated.
>
> Interestingly, the test passes if we use Lemire's algorithm with the truncated significand instead of using the fallback. This might be a coincidence.

so this is basically an invalid test, right?


jshell> var a = 0.19999999999999998335;
a ==> 0.19999999999999998

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PR Review Comment: https://git.openjdk.org/jfx/pull/2069#discussion_r2835404935