Revert "Keys do not need to be converted strings before being dumped to JSON"
Revert "Keys do not need to be converted strings before being dumped to JSON"

This reverts commit a9dfa5d45675f4b3161a57a9859c1ce7673a80bd.

bitzesty/gds-api-adapters,theodi/gds-api-adapters,bitzesty/gds-api-adapters,theodi/gds-api-adapters,alphagov/gds-api-adapters