I asked about this quite some time ago and it was suggested we'd have it:
http://www.nntp.perl.org/group/perl.perl6.language/2003/09/msg15864.html
In reply to Re: [perl6] Complex Attribute Validation and/or Triggers
by trwww
in thread [perl6] Complex Attribute Validation and/or Triggers
by duelafn
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