Use errors.Is for error comparison instead of direct equality checks

[ytnsym]

This PR refactors error handling by replacing direct comparisons of errors (e.g., err == someError) with the use of errors.Is.

[ccoVeille]

I dont see a need for this deprecated one

Remove it, so you can use errors directly without an alias

The call to errors.Wrap can be replaced by fmt.Errorf("%w ...")

errors.New can be used directly from stdlib

[ytnsym]

It looks like errors.Cause is being used in the current implementation, which makes it a bit more challenging to simply remove the alias.

[ccoVeille]

From what I had seen before raising my point, errors.Cause is used only in the code, not in the test file I quoted.

But, I have missed something. And I was wrong

There is this indeed.

assert.Equal(t, errFailed, errors.Cause(multierr.WrappedErrors()[1]))

this could be rewritten to use maybe

assert.ErrorIs(t, multierr, errFailed)

[ccoVeille]

Also, maybe it's time to enable some golangci-lint linters

https://golangci-lint.run/usage/linters/

err113 is exacly the linter you need for catching what you are fixing.

errorlint is a good addition

Of course, this could be considered separately from this PR

[ccoVeille]

Feel free to resolve directly my comment, or fix if you want to try.

But for me my comment was a detail, I'm fine with the code.

And thank you for opening the PR