tuple support for Encodable/Decodable trait #13086
Description
In the serialize crate, it seems that all implementations of tuples for the Encodable and Decodable traits are using {emit,read}_seq and {emit,read}_seq_elt. Should these implementations be using read_tuple (and others) instead? (It looks like read_tuple is never used.) Otherwise, using Encodable/Decodable it's impossible to distinguish between tuples and sequences.