--argument-file can convert binary files to blob

[sesi200]

Requested by @lastmjs via DM

I want to pass in a .wasm file directly as an argument using --argument-file to a function that takes a blob/Vec

Currently, --argument-file only accepts valid candid argument. This feature request would mean that if the file is not a valid candid value and the function takes a blob, then the file would automatically be converted into (blob "<file content").

[sesi200]

This would likely lead to errors that are very hard to debug if the user supplies a file that is supposed to be valid candid but made a syntax error. Should this feature be put behind an extra flag like --argument-file-to-blob?