[perl6/specs] 354bef: Clarify calling .cache more than once

[email protected] (GitHub)
Newsgroups perl.perl6.language
Message-ID <55f46b196049b_15673f89e95412a08278e@hookshot-fe2-cp1-prd.iad.github.net.mail> 
  Branch: refs/heads/master
  Home:   https://github.com/perl6/specs
  Commit: 354bef8e9856f41c842d4d5e20c2695b8e20b6c0
      https://github.com/perl6/specs/commit/354bef8e9856f41c842d4d5e20c2695b8e20b6c0
  Author: Tim Smith <[email protected]>
  Date:   2015-09-12 (Sat, 12 Sep 2015)

  Changed paths:
    M S07-lists.pod

  Log Message:
  -----------
  Clarify calling .cache more than once
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