| This directory should contain a `.case` test case file |
| for each character that is either [_WhiteSpace_](https://tc39.es/ecma262/#sec-white-space) |
| or [_LineTerminator_](https://tc39.es/ecma262/#sec-line-terminators). |
| Because the former is defined in terms of the Unicode "Space_Separator" category, |
| it can change over time even if the ECMAScript specification does not. |
| |
| A current list can be fetched as `[:Space_Separator:]` using a tool |
| such as the Unicode UnicodeSet utility: |
| https://util.unicode.org/UnicodeJsps/list-unicodeset.jsp?a=%5B%3ASpace_Separator%3A%5D&g=&i= |
