Returns whether if a character can be in the tail of an identifier. An identifier is composed of a head (its first char) and a tail (the other chars). A character is an identifier char if it is alphanumeric or if it is one of: - `|`, - `?`, - `<`, - `>`, - `+`, - `-`, - `_`, - `=`, - `^`, - `%`, - `&`, - `$`, - `*`, - `!`,
(ch: char)
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