CommandType
class CommandType @InternalWowApi constructor(val name: String, val type: Class<*>, val aliases: Set<String> = emptySet())
How a command type is named: context.aggregate.CommandName, the class's simple name unless the model gives another. The log records it with each event stream, and a request id reused by a command of another name is rejected rather than taken for a retry; renaming or moving the class does not change it.
aliases are names the type had before (@Alias): a stream recorded under one of them is this command's, so a request retried after the rename is still a retry, and a command forwarded under a former name is still found.