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Several issues and Pr's (e.g. #432 #437 #485) note the desire/assumption that Dancer2 should be fatpackable, though this is not mentioned anywhere in the source or docs.
It looks like the latest releases of MIME::Types (v2.0+) may not by fatpackable as the mime types db was moved to a separate file.
This seems like two issues:
Let me fix the first one and we'll open a new issue for the second.
Fixed by 11d3e3c.