On Fri, 27 Jan 2023 09:35:00 GMT, Sergey Tsypanov <stsypa...@openjdk.org> wrote:

> @Glavo I've filed https://bugs.openjdk.org/browse/JDK-8301220 so you can use 
> it for this PR.

Thank you!

> I think as soon as we anyway assign the array from trusted collection, we 
> don't need `len == 0` check here any more

I think it is necessary to check the length here. 

If the length of the current COWArrayList is not zero, it is necessary to copy 
the elements to a larger new array.

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PR: https://git.openjdk.org/jdk/pull/12212

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