White space strings are no longer considered 0 in number schema

package.json

@@ -1,6 +1,6 @@
 {
   "name": "not-me",
-  "version": "4.3.5",
+  "version": "4.3.6",
   "description": "Easy and type-safe validation",
   "main": "lib/index.js",
   "types": "lib/types.d.ts",

src/schemas/number/number-schema.spec.ts

@@ -28,4 +28,22 @@ describe("Number Schema", () => {
       value: undefined,
     });
   });
+
+  it("Empty strings should be transformed to undefined", () => {
+    const schema: Schema<number | undefined | null> = number();
+
+    expect(schema.validate("")).toEqual({
+      errors: false,
+      value: undefined,
+    });
+  });
+
+  it("Strings with whitespaces should be transformed to undefined", () => {
+    const schema: Schema<number | undefined | null> = number();
+
+    expect(schema.validate("   ")).toEqual({
+      errors: false,
+      value: undefined,
+    });
+  });
 });

src/schemas/number/number-schema.ts

@@ -35,6 +35,20 @@ class NumberSchemaImpl<_Output = number | undefined | null> extends BaseSchema<
         };
       }
     });
+
+    this.wrapValueBeforeValidation = (input) => {
+      if (typeof input === "string") {
+        const trimmed = input.trim();
+
+        if (!trimmed) {
+          return undefined;
+        } else {
+          return trimmed;
+        }
+      } else {
+        return input;
+      }
+    };
   }
 
   integer(message?: string): this {