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/// The decimal digits, in ASCII.
pub const ASCII_DECIMAL: &[char] = &[
    '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
];

/// The hexadecimal digits, in ASCII.
pub const ASCII_HEXADECIMAL: &[char] = &[
    '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
    'a', 'b', 'c', 'd', 'e', 'f', 'A', 'B', 'C', 'D', 'E', 'F',
];