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=item default => I<VALUE>

Default value for the setting. This value will be assigned if that particular
statement is not explicitly used in the configuration file. If I<VALUE>
is a CODE reference, it will be invoked as a method each time the value is
accessed.

Default values must be pure Perl values (not the values that should appear
in the configuration file). They are not processed using the B<check>
callbacks (see below).    
    
=item array => 0 | 1

If B<1>, the value of the setting is an array.  Each subsequent occurrence
of the statement appends its value to the end of the array.

=item re => I<regexp>

Defines a regular expression which the value must match. If it does not,
a syntax error will be reported.