return trimmed ? trimmed : "";

}

function toLowerAscii(input: string): string {

return input.replace(/[A-Z]/g, (char) => String.fromCharCode(char.charCodeAt(0) + 32));

}

/** Normalize device metadata for cross-runtime auth comparisons. */

export function normalizeDeviceMetadataForAuth(value?: string | null): string {

const trimmed = normalizeTrimmedMetadata(value);

if (!trimmed) {

return "";

}

// Keep cross-runtime normalization deterministic (TS/Swift/Kotlin) by only

// lowercasing ASCII metadata fields used in auth payloads.

return toLowerAscii(trimmed);

}

/** Normalize device metadata for policy classification. */

export function normalizeDeviceMetadataForPolicy(value?: string | null): string {

const trimmed = normalizeTrimmedMetadata(value);