Major performance issues in ::addCallback on a complex form

Okay merge request created:

1. NestedArray::getValue already checks key exists (or in fact keyExists method actually calls getValue so this reduces a lot of overhead by not doing the same thing twice given we are comparing many arrays with an array
2. Drastically lower the depth to travel; the argument for it was for Gin, but Gin's depth is not 10 levels deep: https://git.drupalcode.org/project/gin/-/blob/8.x-3.x/src/GinContentForm...

@scott_euser
Thank you for the MR. I checked it and it looks good!
We will include that change in the next release

Great thank you!

@scott_euser We have released 1.3.0 with your patch. Thank you for the contribution.

Great thanks for taking care of it (and the other issues you released!). Much appreciated

Automatically closed - issue fixed for 2 weeks with no activity.