operator precedence not always respected in arithmetic structures from Abstract model, missing brackets about pysd HOT 1 CLOSED

>>> from pysd.translators.vensim.vensim_element import Component
>>> expr1 = Component("my_expr", ([], []), "1 * (2 + 3-4)")
>>> expr1.parse()
>>> expr1.ast
ArithmeticStructure(
    operators=['*'],
    arguments=(
        1,
        ArithmeticStructure(
           operators=['+', '-'],
           arguments=(2, 3, 4)
        )
    )
)
>>> expr2 = Component("my_expr", ([], []), "1 * (2 + 3^4)")
>>> expr2.parse()
>>> expr2.ast
ArithmeticStructure(
    operators=['*'],
    arguments=(
        1,
        ArithmeticStructure(
            operators=['+'],
            arguments=(
                2,
                ArithmeticStructure(
                    operators=['^'],
                    arguments=(3, 4)
                )
            )
        )
    )
)