/**
 * Test whether two arguments are equal.
 *
 * @param x The first argument to compare.
 * @param y The second argument to compare.
 * @return Whether two arguments are equal or not.
 */
export declare function equal_to<T>(x: T, y: T): boolean;
/**
 * Test whether two arguments are not equal.
 *
 * @param x The first argument to compare.
 * @param y The second argument to compare.
 * @return Returns `true`, if two arguments are not equal, otherwise `false`.
 */
export declare function not_equal_to<T>(x: T, y: T): boolean;
/**
 * Test whether *x* is less than *y*.
 *
 * @param x The first argument to compare.
 * @param y The second argument to compare.
 * @return Whether *x* is less than *y*.
 */
export declare function less<T>(x: T, y: T): boolean;
/**
 * Test whether *x* is less than or equal to *y*.
 *
 * @param x The first argument to compare.
 * @param y The second argument to compare.
 * @return Whether *x* is less than or equal to *y*.
 */
export declare function less_equal<T>(x: T, y: T): boolean;
/**
 * Test whether *x* is greater than *y*.
 *
 * @param x The first argument to compare.
 * @param y The second argument to compare.
 * @return Whether *x* is greater than *y*.
 */
export declare function greater<T>(x: T, y: T): boolean;
/**
 * Test whether *x* is greater than or equal to *y*.
 *
 * @param x The first argument to compare.
 * @param y The second argument to compare.
 * @return Whether *x* is greater than or equal to *y*.
 */
export declare function greater_equal<T>(x: T, y: T): boolean;
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