fix(clean): strip surrounding whitespace

__test__/clean.test.ts

@@ -0,0 +1,23 @@
+import { describe, expect, test } from "bun:test";
+
+import { clean } from "../src/_util/clean";
+
+describe("clean", () => {
+  test("removes surrounding whitespace", () => {
+    // Newlines and tabs are not in the separator set, so without the
+    // trailing trim they would survive and break length/format checks.
+    expect(clean("988077917\n", " -")).toBe("988077917");
+    expect(clean("\t 988077917 ", " -")).toBe("988077917");
+    expect(clean("\r\n12 34\r\n", " -")).toBe("1234");
+  });
+
+  test("preserves internal characters and removes separators", () => {
+    expect(clean("123-456 789", " -")).toBe("123456789");
+    expect(clean("a b", "")).toBe("a b");
+  });
+
+  test("normalizes unicode separators before stripping", () => {
+    // en dash -> ascii hyphen, then removed by the strip set
+    expect(clean("123–456", " -")).toBe("123456");
+  });
+});

__test__/no.test.ts

@@ -15,6 +15,16 @@ describe("no.orgnr", () => {
     expect(r.valid).toBe(true);
   });
 
+  test("valid with surrounding whitespace", () => {
+    // compact() trims newlines/tabs that the separator set misses.
+    expect(no.orgnr.validate("988077917\n").valid).toBe(
+      true,
+    );
+    expect(no.orgnr.validate("\t 988077917 ").valid).toBe(
+      true,
+    );
+  });
+
   test("invalid checksum", () => {
     const r = no.orgnr.validate("988077918");
     expect(r.valid).toBe(false);

src/_util/clean.ts

@@ -63,7 +63,12 @@ const CHAR_REGEX = new RegExp(
 
 /**
  * Normalize Unicode artifacts to ASCII
- * equivalents and strip the given characters.
+ * equivalents, strip the given characters, and
+ * remove surrounding whitespace.
+ *
+ * The trailing trim removes whitespace outside the
+ * separator set (newlines, tabs) so validators
+ * accept copy-pasted input.
  *
  * @param value - The input string
  * @param strip - Characters to remove
@@ -82,5 +87,5 @@ export const clean = (
       result = result.replaceAll(ch, "");
     }
   }
-  return result;
+  return result.trim();
 };