The use of an annotative '#e' to get an exact number contrasts with Perl 6's choices for the default interpretation of number literals. The Perl 6 choice adopts scientific notation to correspond to floats:

    200000000000000000000  # exact (integer)  2 * 10 ** 20 
    0.00000000000000000002 # exact (rational) 2 * 10 ** -20
    0.2e-19                # inexact (float)  2 * 10 ** -20
    2e20                   # inexact (float)  2 * 10 ** 20