behavior change in TopDocs#order_by_u64_field

[mdumandag]

As stated in the documentation, and in previous versions of tantivy, we were able to use any type of the field in this method, but after #2726, there is a check in the SortByStaticFastValue struct that verifies the field is not only fast, but of the exact type of the output of the collector. (i.e. u64 for this method).

Now, if you try to pass a i64 field, you get an error.

Is this the expected behavior now?

[fulmicoton]

I am afraid so.
You can rely on SortByErasedType to get a consistent sort that will work accross segment regardless of whether the field was i64, u64, or f64.