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that stores and restores context to make sure correct context travels
with your code.

    async_call( callback => cb_w_context { context->{good} = shift } );

Make sure that all callbacks in your code are created with this function
or you can loose track of your context.

=cut

sub cb_w_context(&) {
    my $cb = $_[0];
    my $ctx = $CTX;
    return sub {
        $CTX = $ctx;
        goto &$cb;
    };
}


=head1 AUTHOR