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result. Form::Tiny does not copy fields that are not declared explicitly to
output regardless of the strict mode being turned on.

For example, if your form contains many optional fields which change often, you
may want to ensure that your users are not sending anything you're not going to
handle. This can help debugging and prevent errors.

B<Important note>: Strict mode will cause the system to crawl your entire input
data to search for any odd elements. This will cause validation to only run at
about half the speed, and more importantly it will not be able to cope with
circular references (even weakened). If your input data may contain circular
references you should not make use of the strict mode.

=head3 Filters

Turned on by L<Form::Tiny::Plugin::Filtered> plugin or with the C<-filtered>
flag in L<Form::Tiny>.

Enables initial filtering for the input fields. This behavior is added to the
form as a C<before_mangle> hook.