Do not mark some valid identifiers as invalid

Some identifiers like "@aa" were marked as invalid as "aa" is a
potentially hexadecimal value, but the "@" symbol actually disambiguates
this situation. Hence, if a non-alphanumeric character (that the parser
liked) is actually found, ensure it cannot be considered as an
hexadecimal value.

Provide also a test of is_valid_identifier(). The list is certainly not
exhaustive, but it should be good enough coupled with end-to-end tests.

Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>

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