24.4 Identifiers
| ISO Standard: | “Which additional multibyte characters may appear in identifiers and their correspondence to universal character names (6.4.2).” | 
| Implementation: | None. | 
| ISO Standard: | “The number of significant initial characters in an identifier (5.2.4.1, 6.4.2).” | 
| Implementation: | All characters are significant. | 
