If anyone runs into this same problem today, 
sorry, we merged a gem update that seems to have caused the same problem
We think it’s broken as of:
https://github.com/discourse/discourse/commit/3b6ea02787df6fc8af97c53778c005bf735ff1cc
and fixed as of:
https://github.com/discourse/discourse/commit/7f5b062d3d8f0575f2ab8e3acd3c6cbd24633434