Fatal error: Cannot declare class - Joomla 3.7

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Can you please tell us which change in Joomla 3.7 caused this and any other compatibility break?

Joomla 3.7 introduced a new check that prevents two classes to have the same name (even though the documentation still says the two should be named the same way)

I see that core has named its admin helper class differently, of this pattern: ExampleHelper instead of ExampleHelperExample or ExampleHelperExampleadmin.

Further, I discovered a new dependency upon this naming pattern for this class. In order to add the new custom fields feature to a component, a plugin expects a component's admin helper class to have certain functions available to it, and it expects that helper class to follow the naming pattern: ExampleHelper. I discovered this when trying to add the new custom fields feature to an extension that I newly created with ComponentCreator. I was able to get the new feature to work (within the CC-created extension) by creating the needed helper class (ExampleHelper), adding the new functions used by custom fields, and having it extend the CC-created helper class (ExampleHelperExampleadmin).

I do not know all the details that led CC to choose the solution it did (ExampleHelperExampleadmin), but from what I'm seeing, this file/class name seems to stray from the "core" approach, and I suspect it will cause problems should anyone want to add the custom fields feature to a CC-created component. I may be wrong, and if so, please correct me. But I do want to give you a "heads up" to what I think I'm seeing.