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croak "Tie::Watch::new(): -variable is required." if not defined $variable;
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my($type, $watch_obj) = (ref $variable, undef);
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@arg_defaults{@scalar_callbacks} = (
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[\&Tie::Watch::Scalar::Destroy], [\&Tie::Watch::Scalar::Fetch],
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[\&Tie::Watch::Scalar::Store]);