RFR: 8377427: Reduce substring allocations in Color.web(String, double) [v2]

[Michael Strauß]

On Tue, 10 Feb 2026 19:05:18 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

>> On the JVM, `-0 == 0`. It seems to me that this sentence just spells it out, doesn't it?
>
> I don't know.  The new parser parses "-0.0" as -0.0, and while (-0.0 == 0.0), the result of some other operations is different (1/-0.0 = -Infinity).
> 
> Does it constitutes a regression risk for applications?

`CssNumberParser` parses "-0" correctly as -0, just like `Double.parseDouble()` currently does. The existing code in `Color` is unchanged.

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PR Review Comment: https://git.openjdk.org/jfx/pull/2069#discussion_r2790083018