message: Delegate to inner type for encode_format
  In the ToSql impls for &T and Option<T>, override encode_format to
  delegate to the impl for T. This ensures that if T overrides this
  method, it also overrides it for &T and Option<T>.
diff: @@ -868,6 +868,10 @@ where
  T::accepts(ty)
  }
  + fn encode_format(&self) -> Format {
  + (*self).encode_format()
  + }
  +
  to_sql_checked!();
  }
  @@ -887,6 +891,13 @@ impl<T: ToSql> ToSql for Option<T> {
  <T as ToSql>::accepts(ty)
  }
  + fn encode_format(&self) -> Format {
  + match self {
  + Some(ref val) => val.encode_format(),
  + None => Format::Binary,
  + }
  + }
  +
  to_sql_checked!();
  }
  