/**
 * Checks if a value is a valid number
 * Handles: number type, string conversion, empty strings
 * Uses NaN check: value - value === 0 (only true for valid numbers)
 */
export declare function isNumber(value: unknown): boolean;
/**
 * Converts a value to a number or returns null if invalid
 * Handles: number type, string conversion, preserves valid numbers
 */
export declare function toNumber(value: unknown): number | null;
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