[BUG] Internal digit separators don't work for hex when the hex options were created from a base #241

use core::num::NonZeroU8;

use lexical::{NumberFormat, NumberFormatBuilder, ParseIntegerOptions, parse_with_options};

const BASE: u128 = NumberFormatBuilder::new()
    .digit_separator(NonZeroU8::new(b'_'))
    .internal_digit_separator(true)
    .case_sensitive_base_prefix(true)
    .build_strict();

const HEX: u128 = NumberFormat::<BASE>::builder()
    .base_prefix(NonZeroU8::new(b'x'))
    .radix(16)
    .build_strict();

const HEX_OPTIONS: ParseIntegerOptions = ParseIntegerOptions::from_radix(16);

fn main() {
    println!(
        "{:?}",
        parse_with_options::<i128, _, HEX>("0x1234_5678", &HEX_OPTIONS)
    );
}