///
/// The general categories for numbers (`Nd` for decimal digits, `Nl` for letter-like numeric
/// characters, and `No` for other numeric characters) are specified in the [Unicode Character
- /// Database][ucd] [`UnicodeData.txt`].
+ /// Database][ucd] [`UnicodeData.txt`]. Note that this means ideographic numbers like '三'
+ /// are considered alphabetic, not numeric. Please consider to use `is_ascii_digit` or `is_digit`.
+ ///
+ /// This method doesn't cover everything that could be considered a number, e.g. ideographic numbers like '三'.
+ /// If you want everything including characters with overlapping purposes then you might want to use
+ /// a unicode or language-processing library that exposes the appropriate character properties instead
+ /// of looking at the unicode categories.
+ ///
+ /// If you want to parse ASCII decimal digits (0-9) or ASCII base-N, use
+ /// `is_ascii_digit` or `is_digit` instead.
///
/// [Unicode Standard]: https://www.unicode.org/versions/latest/
/// [ucd]: https://www.unicode.org/reports/tr44/
/// assert!(!'K'.is_numeric());
/// assert!(!'و'.is_numeric());
/// assert!(!'藏'.is_numeric());
+ /// assert!(!'三'.is_numeric());
/// ```
#[must_use]
#[stable(feature = "rust1", since = "1.0.0")]