Hum, this probably does not really answer your question, and I am not even sure I really understand your question, but it seems to me that the intermediate results are not always integers, but sometimes rats. So that when you multiply them, even if you end up with something looking like an integer, it has been computed as a rat.

Removing the list product from your function to see the list of computed values: 

sub infix:<list_vals> {  ($^n ... 0) Z/ 1 .. $^p }
say 10 list_vals 3;    # -> (10 4.5 2.666667)
sub infix:<choose> { [*] ($^n ... 0) Z/ 1 .. $^p }
say 10 choose 3;       # -> 120 (rat)

[download]

In reply to Re: Something that bugs me about the Numeric class hierarchy in Perl 6 by Laurent_R
in thread Something that bugs me about the Numeric class hierarchy in Perl 6 by grondilu

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.