POCO C++ Libraries

From <http://pocoproject.org/forum/viewtopic.php?f=12&t=1218>:

I use POCO 1.3.5. # I love this library.(^_^)

in line 456 MailMessage.cpp.
The Function contentTransferEncodingToString is below.
--
const std::string&
MailMessage::contentTransferEncodingToString(ContentTransferEncoding
encoding)
{
switch (encoding)
{
case ENCODING_7BIT:
! return CTE_8BIT;
case ENCODING_8BIT:
return CTE_8BIT;
case ENCODING_QUOTED_PRINTABLE:
return CTE_QUOTED_PRINTABLE;
case ENCODING_BASE64:
return CTE_BASE64;
default:
poco_bugcheck();
}
return CTE_7BIT;
}
--
Why in case ENCODING_7BIT , this function return CTE_8BIT ?
I think CTE_7BIT is correct. Is this a bug ?
Please teach me.