Mixed type sequences values

[lithper]

Hi,

First of all, thanks for schemars!

This following is more of a question than an issue.
When trying to deduce a schema from a value, sequences with mixed types are specified with no items information, as shown in from_value.rs~json_value.json.

Any reason oneOf isn't used in such cases instead?
Granted, the values may be an instance of a tuple rather than a mixed-type array, but that seems like a private case of the more generic oneOf?

Thank you!