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

[Andy Goryachev]

On Fri, 20 Feb 2026 23:18:18 GMT, Michael Strauß <mstrauss at openjdk.org> wrote:

>> so this is basically an invalid test, right?
>> 
>> 
>> jshell> var a = 0.19999999999999998335;
>> a ==> 0.19999999999999998
>
> In contrast to a `long` literal, a `double` literal can have any number of digits. The value of the literal is then determined by the IEEE-754 round-to-nearest and ties-to-even rule (like in this algorithm). This is why the literal `0.19999999999999998335` has a value of 0.19999999999999998 (the nearest representable value). For comparison, the literal `0.19999999999999997` also has the value 0.19999999999999998.

Right, but we are not testing a double literal.  We are testing the equivalence to `Double.parseDouble()`, correct?

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PR Review Comment: https://git.openjdk.org/jfx/pull/2069#discussion_r2835482660