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        method => 'divide',
        calc   => 'divide',
        prio   => 50,
    },
    '(' => {method => 'bracket_left',},
    ')' => {method => 'bracket_right',},
);

has 'variables'      => (is => 'rw', isa => 'ArrayRef', default    => sub {[]});
has 'formula'        => (is => 'ro', isa => 'Str',      default    => sub {[]});
has '_tokens'        => (is => 'ro', isa => 'ArrayRef', lazy_build => 1,);
has '_rpn'           => (is => 'ro', isa => 'ArrayRef', lazy_build => 1,);
has '_op_indent'     => (is => 'rw', isa => 'Int',      default    => 0,);
has 'used_variables' => (is => 'ro', isa => 'ArrayRef', lazy_build => 1,);

has 'on_error' => (
    is        => 'rw',
    predicate => 'has_on_error',
    clearer   => 'clear_on_error',
);
has 'on_missing_token' => (
    is        => 'rw',
    predicate => 'has_on_missing_token',
    clearer   => 'clear_on_missing_token',