Add missing iterable stubs

[jdecool]

Some iterable class missing in stubs.

This PR add some of them: FilterIterator, CallbackFilterIterator & RecursiveCallbackFilterIterator.

[ondrejmirtes]

New generic classes also need to be added to this array

phpstan-src/conf/config.neon

Line 25 in 89c16a6

skipCheckGenericClasses: []

so that we don't start requiring user to specify their type variables everywhere.

[ondrejmirtes]

The integration tests found this error:

 ------ ----------------------------------------------------------------------- 
  Line   tests/Composer/Test/Package/Archiver/ArchivableFilesFinderTest.php     
 ------ ----------------------------------------------------------------------- 
  29     Property                                                               
         Composer\Test\Package\Archiver\ArchivableFilesFinderTest::$finder      
         type has no value type specified in iterable type                      
         Composer\Package\Archiver\ArchivableFilesFinder.                       
         💡 See:                                                                 
         https://phpstan.org/blog/solving-phpstan-no-value-type-specified-in-i  
         terable-type                                                           
 ------ ----------------------------------------------------------------------- 

The ArchivableFilesFinder class extends FilterIterator. It's a concern for me why:

1. The error hasn't been reported previously (it should be).
2. It's started to be reported now.

What I suspect that this is some kind of mix up between implicit and explicit mixed which got changed with generics.

Can you please debug this? Thanks.

[jdecool]

Can you please debug this? Thanks.

I didn't leave a comment after my last push to warn you that I was watching this issue.

I'm going to debug it, I'll let you know when I found something.

Thanks.

[ondrejmirtes]

I'd be happy if the error "type has no value type specified in iterable type" wasn't started to be reported in this situation even after this PR - so this build should continue to be green even for Composer codebase.

[jdecool]

Hi @ondrejmirtes after working a little on this PR, I've to admit that I'm not sure how to fix this issue.

Couldn't we update the integration tests?

[ondrejmirtes]

One idea - try to rebase on top of dev-master, it might be fixed.

[ondrejmirtes]

Thank you! I merged it and will deal with the errors on master :)

[jdecool]

Thanks @ondrejmirtes

You make an awesome work with phpstan