[Coco] What are the rules for naming basic09 variables ?

[James Jones]

I'd have to look or experiment to confirm the 29-character limit, though I
have no reason not to believe it and it would make sense if symbol table
entries are 32 bytes. The rest I can confirm is exactly right. Variable
(and parameter) names must start with a letter, with the remaining being
either letters, digits, or underscores, optionally ending with dollar sign
but only if its type is string.