Inaccurate documentation about identifiers

Hello,

The documentation states:

"SQL identifiers and key words must begin with a letter (a-z, but also letters
with diacritical marks and non-Latin letters) or an underscore (_). Subsequent
characters in an identifier or key word can be letters, underscores, digits
(0-9), or dollar signs ($)"

However, it seems that all non-ASCII characters are considered "letters" by the