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Idiom #192 Declare a real variable with at least 20 digits

Declare a real variable a with at least 20 digits; if the type does not exist, issue an error at compile time.

(def a 1234567890.12345678901M)
decimal a = 1234567890.12345678901m;
  integer, parameter :: qp = selected_real_kind(20)
  real(kind=qp) :: a
import "math/big"
a, _, err := big.ParseFloat("123456789.123456789123465789", 10, 200, big.ToZero)
use bignum;
my $a = 12345678901234567890.1234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890;
import decimal	
a = decimal.Decimal('1234567890.123456789012345')
require 'bigdecimal'
a = BigDecimal('1234567890.12345678901')
use rust_decimal::Decimal;
use std::str::FromStr;
let a = Decimal::from_str("1234567890.123456789012345").unwrap();

New implementation...
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