fix: nullable number not passing the nullable checks

src/items/nullable.ts

@@ -19,7 +19,7 @@ export default class SchemaNullable<Type extends SchemaItem> extends SchemaItem<
 	public override parse(input: unknown, options?: { fast?: boolean }): ValidationResult<SchemaInfer<Type> | undefined> {
 		const res = super.parse(input, options)
 		if (!res.valid) {
-			return res
+			return this.child.parse(input, options)
 		}
 
 		if (this.isNull(res.object)) {

tests/Schema.test.ts

@@ -63,6 +63,14 @@ test('number', () => {
 	expect(c.parse(1).valid).toBe(true)
 	expect(c.parse('2').valid).toBe(true)
 	expect(c.parse(true).valid).toBe(false)
+
+	// handle parsing a nullable number
+	// @ts-ignore
+	c = s.number().parseString().nullable()
+	expect(c.parse(1).valid).toBe(true)
+	expect(c.parse('2').valid).toBe(true)
+	expect(c.parse(null).valid).toBe(true)
+	expect(c.parse(true).valid).toBe(false)
 })
 
 test('object', () => {