Gender not specified for some units in "de" -> by design?

[Kip Cole]

I'm adding support for grammatical features to my libs. Am unsure if the lack of gender in some units for the "de" locale means I should open an issue or if I'm missing something about how these should be handled. Examples (in "de" which has gender for many units):  dunam, karat, mole . There are others like liter-per-kilometer but the gender here can be derived by the rules in grammaticalFeatures  

Suggestions welcome, especially as to what gender to apply if none is described.

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