+which the fields map to. The fields are seperated by the ':' character
+in the configuration (no matter what is configured for the 'delimiter'
+option).
+.IP hash_size
+The size of the hash table. A larger value means less probability of a
+collision so records will be found faster, at the expense of greater
+memory usage. Having a hash_size in the range of 30-100% of the number
+of passwd file records is reasonable.
+.IP ignore_empty
+When set to "yes", the default, empty fields in the input will be
+skipped and the RADIUS attribute will not be added. By setting this
+value to "no", all attributes in the format list will always be added,
+even if they have no value.
+.IP ignore_nislike
+If set to 'yes', then all records from the file beginning with the '+'
+sign will be ignored. The default is 'no'.