DuplicateArrayKey - String keys are not supported in unpacked arrays

[bendavies]

https://psalm.dev/r/b55ef4e286

muglug: @bendavies mind creating an issue for that? I think it should only warn for array<string, string>

[psalm-github-bot]

I found these snippets:

https://psalm.dev/r/b55ef4e286

<?php

class Foo
{
    protected function one(): array
    {
        return [
            'one',
            'two',
            'three',
        ];
    }

    protected function two(): array
    {
        return [
            'four',
            'five',
            'six',
        ];
    }

    public function three(): array
    {
        return [...$this->one(), ...$this->two()];
    }
}

Psalm output (using commit 306ed07):

ERROR: DuplicateArrayKey - 25:20 - String keys are not supported in unpacked arrays

ERROR: DuplicateArrayKey - 25:37 - String keys are not supported in unpacked arrays