In the report linked at https://twitter.com/LedgerTips/status/830238616261586945, I wanted to apply some journal directives to affect formatting of the output. I expected this to work:

$ echo "commodity 0,000,000 bytes" > tarsnap.preamble.journal
$ hledger -f tarsnap.preamble.journal -f tarsnap.csv bal

It didn't, nor does hledger -f tarsnap.preamble.journal -f tarsnap.journal ..., because directives affect only the file they are in, and not other files specified with additional -f arguments.

Ideally, this would just work, but there might be some complexities. Should directives affect subsequent files on the command line, or all files specified ? Should they affect just journal files, or all file types ? Would some directives work differently from others ? (Eg some directives are location-independent and some are not.)