Constant lexical_write_integer::format::PERL_LITERAL

pub const PERL_LITERAL: u128 = NumberFormatBuilder::new().digit_separator(num::NonZeroU8::new(b'_')).no_special(true).internal_digit_separator(true).fraction_leading_digit_separator(true).exponent_leading_digit_separator(true).trailing_digit_separator(true).consecutive_digit_separator(true).build(); // 202_824_096_038_269_144_944_028_451_603_468u128

Number format for a Perl literal floating-point number.