metadata retrieval requires ids not Into<ids>

[molpopgen]

For example, from edge_table.rs:

    pub fn metadata<T: metadata::MetadataRoundtrip>(
        &'a self,
        row: EdgeId,
    ) -> Result<Option<T>, TskitError> {
        let buffer = metadata_to_vector!(self, row.0)?;
        decode_metadata_row!(T, buffer)
    }

The type of row should be E: Into<EdgeId>

[molpopgen]

Hmm -- this is trickier than I'd like. The current API requires specifying the type of the metadata object. Adding a second generic requires adding a , _ to all calls, telling the compiler to deduce the type. That's arguable less ergonomic than saying 0.into() in the function call (which also doesn't break API).

[molpopgen]

1.63.0 allows what we want via a backwards-compatible change.

[molpopgen]

1.63.0 allows what we want via a backwards-compatible change.

Since I didn't write a note about what this was:

fn foo(x: impl Into<Y>) is what I meant.

[molpopgen]

closed via #633