RFR: 8186085: (opt) add filter(), flatMap(), and map() methods to OptionalDouble/Int/Long

[Kartik Ohri]

On Sun, 1 Nov 2020 14:27:41 GMT, Rémi Forax <github.com+828220+forax at openjdk.org> wrote:

>> Thank you for the suggestions. I'll try fixing some bugs first. Should I close this PR as well or leave it open ?
>
> If it doesn't break your hart too much, yes please.

Sure, no worries. I am new to the project and understand that it'll take some time to understand how the project works and make some valuable contributions. In the future, I'll take care of first discussing on the appropriate mailing list before proposing patches. Thanks again.

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PR: https://git.openjdk.java.net/jdk/pull/857