Fix ow.number message when NaN is encountered (#232)

Co-authored-by: Sindre Sorhus <sindresorhus@gmail.com>

source/predicates/predicate.ts

@@ -86,8 +86,9 @@ export class Predicate<T = unknown> implements BasePredicate<T> {
 				// We do not include type in this label as we do for other messages, because it would be redundant.
 				const label_ = label?.slice(this.type.length + 1);
 
+				// TODO: The NaN check can be removed when `@sindresorhus/is` is fixed: https://github.com/sindresorhus/ow/issues/231#issuecomment-1047100612
 				// eslint-disable-next-line @typescript-eslint/prefer-nullish-coalescing
-				return `Expected ${label_ || 'argument'} to be of type \`${this.type}\` but received type \`${is(value)}\``;
+				return `Expected ${label_ || 'argument'} to be of type \`${this.type}\` but received type \`${Number.isNaN(value) ? 'NaN' : is(value)}\``;
 			},
 			// eslint-disable-next-line @typescript-eslint/no-unsafe-return, @typescript-eslint/no-unsafe-call
 			validator: value => (is as any)[typeString](value),

test/number.ts

@@ -10,6 +10,10 @@ test('number', t => {
 		ow('12' as any, ow.number);
 	}, {message: 'Expected argument to be of type `number` but received type `string`'});
 
+	t.throws(() => {
+		ow(Number.NaN as any, ow.number);
+	}, {message: 'Expected argument to be of type `number` but received type `NaN`'});
+
 	t.throws(() => {
 		ow('12' as any, 'foo', ow.number);
 	}, {message: 'Expected `foo` to be of type `number` but received type `string`'});