Uh, using 'form-data/multipart' sends the query without the binary. However, using the correct 'multipart/form-data' sends a correct looking query (with the binary) which confuses 'CGI.pm' big time.

Saving the received query 'as is' and doing a 'vi' on it shows that all the end of lines are in binary (^M in vi) but CGI does not seem to recognize them, the bastard.

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