programming-history

Unicode support

Identifiers

• 💯: follows UAX-31.
• ✓: allows Unicode in some form.
• ✗: does not allow Unicode.

Char type

• 💯: can represent all emoji (e.g. no distinguishing between characters and strings).
• ✓: can represent all codepoints.
• ✗: cannot represent all codepoints.

Language	Identifiers	Char type
C#	✓ L|Nl|'_' (L|Pc|Nd|Nl|Mn|Mc|Cf)*	✗ (UTF-16 code unit)
Haskell	✓ Ll|Lu|Lt (Ll|Lu|Lt|Nd|'_'|''')*	✓
Java	✓ L|Nl|Sc|Pc (L|Sc|Pc|Nd|Nl|Mn|Mc|Cf|Cc)*	✗ (UTF-16 code unit)
Python 3	💯 XID_Start XID_Continue*	💯
Swift	✓ (see link)	✓ (can represent extended grapheme clusters as well)