[VarDumper] Add EnumStub for dumping virtual collections with casters #15837
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Currently, casters may use arrays to represent a collection of virtual values. They are curently dumped the same as regular arrays, and this leads to noisy output (like the
array:%n
prefix, or the quotes around "keys").This PR adds a new EnumStub for these situations.
Here is an example when using PdoCaster:
Before :

After:
