BUPKIS
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    Variable negativeAssertionConst

    negativeAssertion: AssertionStandardSchemaSync<
        readonly [readonly ["to be negative", "to be a negative number"]],
        ZodNumber,
        never,
    > = ...

    Asserts that the subject is a negative number.

    expect(-42, 'to be negative'); // passes
    expect(1, 'to be negative'); // fails
    expect(0, 'to be negative'); // fails