For the `Intl.NumberFormat` test cases with `ja-JP` and `zh-TW` locales, it has been observed that spaces appear before and after the number when using `long` for `unitDisplay`. https://github.com/tc39/test262/blob/f0dc15c6c7ec095ba3caf3acc0f8665394665841/test/intl402/NumberFormat/prototype/format/unit-ja-JP.js#L58 However, these spaces are not explicitly specified in [the ECMA-402 specification](https://tc39.es/ecma402/#sec-intl.numberformat.prototype.format). ```js const nf = new Intl.NumberFormat("ja-JP", { style: "unit", unit: "kilometer-per-hour", unitDisplay: 'long' }); nf.format(987) ``` Given this observation, both of the following formats should be considered acceptable outputs for the above code: - `時速 987 キロメートル` - `時速987キロメートル` and even these too? - `時速 987キロメートル` - `時速987 キロメートル`