#4076 introduced the following private classes:

• AbstractIterableAssert.FactoryBasedAssert
• AbstractCollectionAssert.FactoryBasedAssert
• AbstractListAssert.FactoryBasedAssert

They should be merged into their respective counterparts, as done in 61c4e25:

• IterableAssert
• CollectionAssert
• ListAssert

When doing so, we might want to keep the new factory-based constructor with package-private visibility, as depending code should still favor factory methods in Assertions and the withElementAssert API.

Given that this change breaks backward compatibility, it should be done in version 4 only.