export declare function encodeStringArray(array: string[]): string;
export declare function decodeStringArray(encodedString: string): string[];
export declare function encodeString(str: string | null): string | null;
export declare function decodeString(encodedString: string | null): string | null;
export declare function toLowerCaseArray(array: string[]): string[];
export declare function toLowerCaseString(str: string | null): string | null;
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