EME support for CENC with AES-CBC?

I am curious whether this group intends to say anything about support for the AES-CBC encryption mode for ISOBMFF with CENC. I have been reviewing the amendments to the CENC spec, specifically “Part 7: Common encryption format for ISO base media file format, AMENDMENT 1: AES-CBC-128 and key rotation”. I am wondering how CDMs should expect to handle this — or if it is called out via isTypeSupported().

This may have been discussed and I just cannot find the references to it.

Joe