BUPKIS
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    Variable booleanAssertionConst

    booleanAssertion: AssertionStandardSchemaSync<
        readonly [readonly ["to be a boolean", "to be boolean", "to be a bool"]],
        ZodBoolean,
        never,
    > = ...

    Asserts that the subject is a boolean value.

    expect(true, 'to be a boolean'); // passes
    expect('true', 'to be a boolean'); // fails