Transfer encoding not preserved

I have a hash representing a MIME message (headers and :body) and when I feed it to Mail.new() it mostly works, except that when I call .encoded on the new message, all the content-transfer-encodings get changed. I would be very very nice if the octets in the body of Mail.new(str).encoded were the same as the octets in the body part of str

Start by reproducing the issue through Mail.new() with a hash containing MIME headers and :body, then compare the body octets from the input with the result of .encoded. Trace the parsing and content-transfer-encoding path and verify that the original encodings and body octets are preserved.

Written by the indexing model from the issue text.