Patch Changes

• Fixed createHref() so optional route params set to null are omitted instead of serialized as "null", and empty pathname variables throw instead of generating hrefs that cannot match their pattern.

• Fixed route matching so malformed percent-encoded pathnames return no match instead of throwing a URIError.

• Fixed route matching for full URL patterns that include explicit default ports such as http://example.com:80/path and https://example.com:443/path (see #11510).