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This result is analogous to an HTTP response; in fact C<$status> mostly uses
HTTP response codes. C<$reason> is analogous to HTTP status message. C<$payload>
is the actual content (optional if C<$status> is error status). C<%extra> is
optional and analogous to HTTP response headers to specify flags or attributes
or other metadata.

Some examples of enveloped result:

 [200, "OK", ["BTC/USD", "ETH/BTC"]]
 [404, "Not found"]

For more details about enveloped result, see L<Rinci::function>.

=head1 PROVIDED METHODS

=head2 to_canonical_currency

Usage:

 $xchg->to_canonical_currency($cur) => str