This 20 (or 50) limit to the display of faceted values is a terrible idea. It means that less common values will never be surfaced unless a user knows how to work around it (such as adding an additional keyword containing the faceted term needed). The rarer facet values may be the specific ones the user is looking to find. I would prefer that users have the ability to "show more" facets until they have seen all possible values in the data. I do support the ability to choose alphabetical sorting as well.
This 20 (or 50) limit to the display of faceted values is a terrible idea. It means that less common values will never be surfaced unless a user knows how to work around it (such as adding an additional keyword containing the faceted term needed). The rarer facet values may be the specific ones the user is looking to find. I would prefer that users have the ability to "show more" facets until they have seen all possible values in the data. I do support the ability to choose alphabetical sorting as well.