Only the first of multiple entries for the same attribute is shown in GeoJSON

[josephbirkner]

This applies to all objects which have multiple key-value pairs of the same key. An attribute layer is just a special object which has the same problem: Of e.g. multiple entries for SPEED_LIMIT_METRIC, only the first will be shown in GeoJSON.

To remedy this, we need to think of a strategy to present multi-value object keys. This could mean to render multi-value object fields as a key-list pair. However, this would make some queries harder. Any previous query for key.value would need to be written as key.value or key.*.value.

Alternatively, we can move to a JSON renderer which does not prohibit keys from being emitted redundantly - perhaps we go back to speedyj for this one.