Note 2 says
For a floating ::CONSTANT directive the constant value must be a single literal string, or a symbol
that is taken as a constant. An expression enclosed in parentheses is not allowed.
but it should say
For a floating ::CONSTANT directive the constant value must be a single literal string, a symbol
that is taken as a constant, or a valid number optionally preceded by "-" or "+". An expression enclosed in parentheses is not allowed.
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