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How will we deal with this? https://github.com/laminas/laminas-diactoros/blob/2.2.2/src/MessageTrait.php#L164

I see the [suggestive way of displaying]( https://github.com/laminas/laminas-diactoros/blob/2.2.2/src/MessageTrait.php#L94) this seems better: ``` /** * Method to get the array of response headers to be sent when the response is sent...

Yes against all good practice [Laminas uses a Trait](https://github.com/laminas/laminas-diactoros/blob/2.2.2/src/Response.php#L31) to add these methods.

Simple question, why not set your header this way? ``` private function setSomeHeader(string $value) { // you control the separator $separator = ';'; // get either previously set headers or...

I hope they adopt the same approach as it is currently the correct way to set multiple values on a single header. Although I called it a workaround, it is...

I will ask some of the other Maintainer to check my perspective, as I still feel the `false` flag does indicate adding multiple values as part of the contract, and...

> ...another extension can also set "Some-header", unaware of what happened elsewhere... Yes, you are correct. But this is always true, even if the application worked the way you wanted...

> ... I think there's some confusion here Nope no confusion here :) Firstly the solution you gave will not be excepted as it does not fix the issue in...

When I refer to "your proposed solution," I mean this current PR and the code contained within it (although I am aware that it is old). Today was the first...

Please update the PR with the [fix I provided](https://github.com/joomla-framework/application/pull/103#issuecomment-1448917793), also add a test for this issue, to ensure that we now have this issue resolved. @wilsonge have you had time...