joto left a comment (osm2pgsql-dev/osm2pgsql#2429)
I think that's a different use case and we should solve that differently. We'll
need some function to get nodes from ways and members from relations, but not
just their geometries, but the whole object. We don't need `num_nodes()`,
because we have `nodes` and can get the length with `#`. Similarly for members
of a relation. But we need either a `get_node(N)` as you say of a more general
`get_node(ID)` plus the same for relations. But that's a whole can of worms we
open up there, because we need to access the database for that which makes
everything slower and all that. We could have a `as_point(N)` for ways, but
this would not extend well for relations, so I am hesitant to do that.
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