default for RFC4648 codecs is to reject newline characters. If these
characters are significant in the encoding, then this flag is ignored.
.TP
+.B CDCF_IGNSPC
+Ignore whitespace characters (other than newlines) when decoding: the
+default for RFC4648 codecs is to reject whitespace characters. If these
+characters are significant in the encoding, then this flag is ignored.
+.TP
.B CDCF_IGNINVCH
Ignore any other invalid characters appearing in the input when
decoding.