BUPKIS
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    Variable negativeIntegerAssertionConst

    negativeIntegerAssertion: AssertionStandardSchemaSync<
        readonly [readonly ["to be a negative integer", "to be a negative int"]],
        ZodNumber,
        never,
    > = ...

    Asserts that the subject is a negative integer.

    expect(-42, 'to be a negative integer'); // passes
    expect(1, 'to be a negative integer'); // fails
    expect(-42.5, 'to be a negative integer'); // fails