const ParseInfo = struct base: u810 or 16
max_mantissa_digits: usize10^19 fits in u64, 16^16 fits in u64
exp_char_lower: u8e.g. e or p (E and P also checked)
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100const ParseInfo = struct {
// 10 or 16
base: u8,
// 10^19 fits in u64, 16^16 fits in u64
max_mantissa_digits: usize,
// e.g. e or p (E and P also checked)
exp_char_lower: u8,
}