There're files that starts with BOM. When reading from those files, it seems
all of Racket's I/O API don't know to strip the BOM, making them extremely
difficult to work with.
For example, Here is a UTF-8 encoded text file with BOM header. To be exact,
here's the binary layout of the file content:
0000000: efbb bf68 656c 6c6f 2077 6f72 6c64 210d ...hello world!.
0000010: 0a .
Note that the first 3 bytes are BOM.
Now using the below racket program to read it:
(define port (open-input-file #:mode 'text "test.txt"))
(define line (read-line port))
line
`#:mode` is optional, any choice of it doesn't make a difference.
The result is:
"\uFEFFhello world!"
instead of
"hello world!"
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hello world!
