Description:
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In eZ components we're using iconv_mime_encode to encode header 
values. However, we store the result in a hash headerName => 
headerValue. This leads to funny code like:
$value = iconv_mime_encode( 'dummy', $value, $preferences );
$value = substr( $value, 7 ); // "dummy: " + 1

It would be nice to have a config option to iconv_mime_encode to 
just drop the header name alltogether to avoid hacks like this.