fix: handle case insensitivity

src/base.ts

@@ -1,15 +1,36 @@
+export class CaseCopyMap extends Map<string, string> {
+	set(key: string, value: string): this {
+		super.set(`case_copying${key.toLowerCase()}`, key)
+		return super.set(key, value)
+	}
+
+	get(key: string): string | undefined {
+		if (super.has(key)) return super.get(key)
+
+		// Handle case insensitivity
+		const actualKey = super.get(`case_copying${key.toLowerCase()}`)
+		if (actualKey) return super.get(actualKey)
+	}
+
+
+	public get size() : number {
+		return super.size / 2
+	}
+
+}
+
 export class APTBase {
 	/**
 	 * Raw-accessible key-value map of the APT format
 	 */
-	protected raw: Map<string, string>
+	protected raw: CaseCopyMap
 
 	/**
 	 * Base constructor.
 	 * This should never be used.
 	 */
 	constructor() {
-		this.raw = new Map()
+		this.raw = new CaseCopyMap()
 	}
 
 	/**

src/index.ts

@@ -1,3 +1,5 @@
+import { CaseCopyMap } from './base'
+
 export * from './control'
 export * from './packages'
 export * from './release'
@@ -11,7 +13,7 @@ export function parseKV(data: string) {
 	const cleanedData = data.replaceAll(/\r\n|\r|\n/g, '\n').replaceAll(/\0/g, '').normalize().trim()
 	const lineChunks = cleanedData.split('\n') // We know it will always be \n because of our cleanup
 
-	const fields = new Map<string, string>()
+	const fields = new CaseCopyMap()
 	let previousKey = ''
 
 	for (const line of lineChunks) {