export declare const TryGetCountDirectSymbol: unique symbol;
export declare const TryUnwrapUnorderedSymbol: unique symbol;
export interface BuiltInLinqTraits<T> {
    /** Provides specialized implementation for {@link tryGetCountDirect}. */
    [TryGetCountDirectSymbol]?(): number | undefined;
    /**
     * Retrieves the input iterator, if the current LINQ wrapper is only re-ordering
     * the items without changing their values (e.g., sorting).
     *
     * @remarks While this function also implies {@link LinqWrapper.unwrap},
     * implementation _should not_ return `this`, as it can cause caller
     * to enter infinite loop.
     */
    [TryUnwrapUnorderedSymbol]?(): Iterable<T> | undefined;
}
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