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    The test case 123.45*(678.90 / (-2.5+ 11.5)-(80 -19) *33.25) / 20 + 11, particularly the section (80 -19), is giving me a bit of trouble.
    Since the expression wouldn't make sense if the minus sign was interpreted as a negative number (it should be (80 - 19)), does that mean that when you say "However the minus sign attached to negative numbers (-) will never be separated by whitespace", you also mean that the minus sign attached to a number doesn't necessarily make it a negative number?

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    Okay, I fixed the description and added tests for empty arrays.