I know of one format that serde's system doesn't support well. D-Bus requires empty arrays to be aligned according to the type of their element, but serde's sys

I know of one format that serde's system doesn't support well. D-Bus requires empty arrays to be aligned according to the type of their element, but serde's system has no way to tell the serializer any metadata about the type of an array element apart from giving it the array element to serialize. All the serializer gets to know that an array has started and then ended; it doesn't know anything about the element alignment unless it receives at least one element. There is a sort of workaround - preload into the serializer what it is expected to serialize, eg by passing in the D-Bus signature string in the serializer ctor. But a) this is a somewhat unclean solution because everything other than arrays is redundant information that the serializer already gets from the serde::Serialize impl, and b) it's manual work for the user to have to specify this and easy to make a mistake and have the two get out of sync. In my D-Bus library I decided to have my own Serializer setup as a workaround. serde's Deserializer setup still works though so that's not a problem.