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#Generate an enveloped error response (see L<Rinci::function>). Can accept
#arguments in an unordered fashion, by utilizing the fact that status codes are
#always integers, messages are strings, result metadata are hashes, and previous
#error responses are arrays. Error responses also seldom contain actual result.
#Status code defaults to 500, status message will default to "FUNC failed". This
#function will also fill the information in the C<logs> result metadata.
#
#Examples:
#
# err();    # => [500, "FUNC failed", undef, {...}];
# err(404); # => [404, "FUNC failed", undef, {...}];
# err(404, "Not found"); # => [404, "Not found", ...]
# err("Not found", 404); # => [404, "Not found", ...]; # order doesn't matter
# err([404, "Prev error"]); # => [500, "FUNC failed", undef,
#                           #     {logs=>[...], prev=>[404, "Prev error"]}]
#
#Will put C<stack_trace> in logs only if C<Carp::Always> module is loaded.
#
#=head2 warn_err(...)
#
#This is a shortcut for:
#
# $res = err(...);
# warn "ERROR $res->[0]: $res->[1]";
#