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UTF16 encoding adds BOM everywhere?

From: Jean Abou Samra
Subject: UTF16 encoding adds BOM everywhere?
Date: Thu, 14 Jul 2022 21:16:44 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.11.0


With this code:

(let ((p (open-output-file "x.txt")))
  (set-port-encoding! p "UTF16")
  (display "ABC" p)
  (close-port p))

the sequence of bytes in the output file x.txt is

['FF', 'FE', '41', '0', 'FF', 'FE', '42', '0', 'FF', 'FE', '43', '0']

FFE is a little-endian Byte Order Mark (BOM), fine.
But why is Guile adding it before every character
instead of just at the beginning of the string?
Is that expected?

This is a curiosity question; since what I want is
big endian, I just used "UTF16BE", which outputs
big endian, and doesn't add the BOM -- I can then just
add a BOM manually. Still, I'm puzzled by this


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