geoarrow-rs

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Per https://github.com/geoarrow/geoarrow-r/issues/34#issuecomment-1925872634 crs and edges shouldn't return null when not set. Rather, they should be omitted. This can be configured with serde #[serde(skip_serializing_if = "Option::is_none")] on the Option field

https://github.com/geoarrow/geoarrow-rs/blob/eb94df3d998801be3c55128b4535fc9f58652b66/src/array/metadata.rs#L28-L32

good to know about that serde option but we should be checking if all fields are null and not even writing the metadata key in that case

This is solved now. Helped by https://github.com/geoarrow/geoarrow-rs/pull/719 but solved separately before that I think.