What characters are allowed in the field “id” of a c3 entity type?
The “id” field is a string, so there is practically no limit to the characters that can be stored. From my testing, I was able to store all visible ASCII characters in first, last, and central positions. I also did limited testing with UTF-8 and Unicode characters, both with similar results.
The length is the only limitation. By default, the id field is 64 bytes long. UTF-8 characters are stored as 1 byte and Unicode characters are 2 bytes. The id field can store 128 ASCII only characters OR 64 UTF-8 characters OR 32 Unicode characters.