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+======Synopsis:======
+$[[b64decode]](//<stuff>//)
+======Returns:======
+Returns the inverse RFC1421 transformation of //<stuff>//, commonly known
+as Base64.  The inverse transformation converts four Base64 digits into
+three bytes.
+Alas, because ircII only supports C strings, if //<stuff>// decodes to
+binary data (with nuls) it will probably not do what you hope.
+The reverse transformation is [[b64encode]].
+Don't confuse this encoding with the one used by FiSH (popularized by eggdrop
+and other irc clients for encrypted messages).  FiSH uses l64a encoding, and
+can be decoded using the [[xform]] FISH64 transform.
+======Returns:======
+The rfc1421 string //<stuff>// converted into a C string.