File writing in deno deploy

It would be really usefully to be able to write files in deno deploy because when creating simpler projects, it is much easier to use simple json files instead of having to use a database. I'm not sure why this feature is disabled in the fist place but I would really be able to do this in deno deploy.

The request identifies Deno Deploy and a desire to write JSON files, but names no file, test, or entry point. First locate where Deploy’s filesystem permissions and storage behavior are defined, then clarify the persistence and security requirements before determining the relevant tests and completion criteria.

Written by the indexing model from the issue text.